Submitted by
Joshua Kebschull
a Cross Country Rider
from Miami, FL. Date Reviewed: March 19, 2008
Favorite Trail:
have a lot
Duration Product Used:
3 months
Price Paid:
$15.00
Purchased At:
Pricepoint
Strengths:
None, The product alone is garbage
Weaknesses:
The product alone is not versitile enough to fit anyone bike. It probably only fits one lol
Similar Products Used:
none
Bike Setup:
K2 Razorback Team SRAM XO Easton XC 50/70 XT crank DT wheel set
Bottom Line:
When I read the first 10 reviews I thought to myself...Do any of these ppl do any of thier own maintenance on thier bikes other than change a tire? Granted it does take a little work, but if you want this to work and work well, replace the bolts, nuts and bearings before you even install it. Honestly there are just some frames that it just wont work on, but after making the proper modifications ($15 worth). It works like something that you'd probably pay 3-4x as much for! Read the reviews and learn from other's mistakes $30 is nothing for how effective it will be afterwards. I ride here in miami,fl and its not but roots and rocks and cause parts to go back prematurely from chain suck
Value Rating:Overall Rating:
Submitted by
BluesDaddy
a Cross Country Rider
from NC Date Reviewed: August 12, 2005
Duration Product Used:
Less than 1 month
Price Paid:
$12.00
Purchased At:
eBay
Strengths:
Cheap, light, simple
Weaknesses:
Challenging to install properly.
Similar Products Used:
homemade tensioner- didn't work too well...
Bike Setup:
1992 Trek 950 singlespeed conversion
Bottom Line:
I bought the Chain Reactor to run my old Trek as a singlespeed commuter. On this old steel frame with small, slightly oval chainstays, the KORE fits pretty easily. I had read the mtbr reviews that said it doesn't fit some frames, so out of curiosity I tried it on my XC FS bike which has a carbon AMP rear end. There is no way it would ever fit the large rectangular carbon chainstay. Never. On the Trek, I just put it where the chainline dictated and put a piece of inner tube under it to keep it from slipping. I don't ride the Trek in sand or mud so I expect it will be virtually maintenance-free.
Value Rating:Overall Rating:
Submitted by
rett
a
from new hampshire Date Reviewed: March 26, 2004
Favorite Trail:
bear brook
Duration Product Used:
6 months
Price Paid:
$30.00
Purchased At:
naults cyclery
Strengths:
does what it needs to do. Keep the chain from bouncing off track. Pretty easy to get on. the roller is nice and smooth and doesnt put wear on the chain
Weaknesses:
it barly is able to fit on the chainstay. Its not exactly the right shape for it. it swivels way to much from where the arm meets the clamp.
Bike Setup:
GF tassahara turned "freeride"
Bottom Line:
So far i have had no problems with this peice. Iv been doing FR on my XC bike and needed somthing to keep my chain in place cause it bounced off track on hits. ONe of the best things on my bike. Pays for its self too. dont have to buy new deraulers
Value Rating:Overall Rating:
Submitted by
Finch Platte
a Weekend Warrior
from Cali Date Reviewed: October 17, 2003
Favorite Trail:
Snail
Duration Product Used:
Tested or demo'ed only
Price Paid:
$20.00
Purchased At:
Cambria
Strengths:
Looks neato. In the box. On my porch after UPS dropped it off. Why was he laughing? Oh, now I know.
Weaknesses:
Could not install on my Enduro. Chainstays are too big.
Similar Products Used:
Still looking.
Bike Setup:
Specialized Enduro with expensive aftermarket parts, rendering it even heavier.
Bottom Line:
Why, oh why didn't I consult the reviews here? It's only when I received the unit and realized there were no instructions that I Googled. That only brought me back here, and after seeing the reviews, that saved me from expecting too much. I Googled again and found the instructions on Kore's site. I tried to install the unit, but quit after a few minutes, realizing it was going to be futile.
What size hex do they use? It's not on my bike tool or in my regular toolbox. They wouldn't have used American sizing, would they? That would be pretty stupid.
But not as stupid as me for buying this thing without consulting MTBR. I'm sending it back. I hope.
Value Rating:Overall Rating:
Submitted by
nick carleton
a Racer
from san diego Date Reviewed: September 8, 2003
Favorite Trail:
noble canyon
Duration Product Used:
Less than 1 month
Price Paid:
$40.00
Purchased At:
mission cyclery
Strengths:
easy set-up. anyone who had trouble with this is a retard.
Weaknesses:
i got ripped off.
Similar Products Used:
none
Bike Setup:
haro ics 5.0 with xt group, spynergy xyclones, avid mech. discs, many other goods
Bottom Line:
only bought it to do a retro race at big bear (downhill race on a hardtail). i used to lose the chain all the time, now i don't even worry about it. if you're gonna be doing a lot of downhilling, buy an mrp. if u want to spend $20 on something to help the chain stay a little better, buy this product
Value Rating:Overall Rating:
Submitted by
scap
a Cross Country Rider
from bellingham Ma usa Date Reviewed: July 31, 2003
Duration Product Used:
Less than 1 month
Price Paid:
$20.00
Strengths:
cheep
Weaknesses:
Every thing!!!!! Setup, noise,.............
Similar Products Used:
none
Bike Setup:
XC
Bottom Line:
Don’t waste your money.
Value Rating:Overall Rating:
Submitted by
dave quist
a Cross Country Rider
from tokyo, japan Date Reviewed: June 29, 2003
Favorite Trail:
lots of local stuff
Duration Product Used:
Less than 1 month
Price Paid:
$20.00
Purchased At:
lbs
Strengths:
none (piece of junk, made by Da Bomb)
Weaknesses:
NOT KORE, weak spring, crappy set-up (it's made by Da Bomb)
Similar Products Used:
none
Bike Setup:
C-dale Killer V 500. converting to SS
Bottom Line:
a real piece of %$#&. save the twenty, use an old derailluer, or buy a real KORE product. Should've used the twenty for same sake or beer. Only giving it flaming turds, 'cause I have to. Buy anything except this peice of junk (made by Da Bomb)
Value Rating:Overall Rating:
Submitted by
Steven
a
from Eastern Mass Date Reviewed: June 18, 2003
Duration Product Used:
1 Year
Price Paid:
$10.00
Purchased At:
Friend who got it from PricePoint
Strengths:
works
Weaknesses:
Didn't work with three chainrings, falls off and heavy, threw off my shifting
Similar Products Used:
none
Bike Setup:
Trek 4900, deore cranks, raceface bash, psylo xc's, sun rynolite rims on XT hubs
Bottom Line:
Works, keeps chain tight but is heavy, throughs off shifters/derailleurs might as well shorten the chain
Value Rating:Overall Rating:
Submitted by
brett johnson
a Racer
from Tulsa Date Reviewed: May 15, 2003
Favorite Trail:
Turkey
Duration Product Used:
Less than 1 month
Price Paid:
$15.00
Purchased At:
Price Point
Strengths:
Looks
Weaknesses:
Peace of Junk, hardware is cheap, won't ever install right on most frames, goes off track and ruins your spokes.
Bike Setup:
DBR Single Speed Convert
Bottom Line:
Most expensive keychain I've ever purchased. If you race dh or ds buy something more expensive. If you ride xc save your money, adjust your derailer, converting to a single speed, buy a Surly Singleator.
Value Rating:Overall Rating:
Submitted by
Scott P
a Cross Country Rider
from San Jose Date Reviewed: May 15, 2003
Favorite Trail:
Braille
Duration Product Used:
2 Years
Price Paid:
$13.00
Purchased At:
PP
Strengths:
Lite, cheap, works
Weaknesses:
Stock bushing sucks chainwheel stops spinning after 2 rides
Similar Products Used:
No other chain devices in this price range or wheight
Bike Setup:
SLX,Z1,rhinos,heavy tires,north shores
Bottom Line:
Stock this thing sucked. But I liked the idea so I stuffed 4 mini cartridge bearings in the chainwheel after I drilled it out. Made a bracket to fit the large chainstay of the slx & now it works great. No Chain slap, suck, or droppin any mo fo me. It's even lighter now w/out the heavy brass bushing! So if like to take on a little mechanical challenge this product can be one of the best additions to your rig. If you don't like to modify parts to make them work stay away. Cheers
Value Rating:Overall Rating:
Submitted by
Dave
a Weekend Warrior
from Pacifica, Ca, USA Date Reviewed: May 4, 2003
Duration Product Used:
Less than 1 month
Price Paid:
$12.00
Purchased At:
Price Pint
Strengths:
Looks cool...LOL
Weaknesses:
Caused chain suck and scratched on both mine and my buddies frames.
Similar Products Used:
Could two companies be cable of making similar pieces of crap?
Bottom Line:
P.O.S. ! Don't waste your money.
Value Rating:Overall Rating:
Submitted by
Vince
a Weekend Warrior
from Bayonne, NJ Date Reviewed: March 26, 2003
Favorite Trail:
Hartshorne, NJ
Duration Product Used:
Less than 1 month
Price Paid:
$45.00
Purchased At:
Pricepoint
Strengths:
It would have worked great if bolts provided were a little longer.
Weaknesses:
It keeps popping off track that damaged my spokes
Similar Products Used:
None
Bike Setup:
Univega DS 900,Monkey lite2 high riser bars, XTR brakes-shifters-casette & rear deraileur, race face bb and cranks, CKing headset, Thompson seatpost, Marzocchi bomber fork, fizik saddle, WIR 420 rims.
Bottom Line:
This is only compatible to some bikes unless you find a bolt that you want to pay extra for but then a gain for the price that i paid for it should come with free dinner!
Value Rating:Overall Rating:
Submitted by
Royce
a Weekend Warrior
from Onida SD Date Reviewed: March 8, 2003
Favorite Trail:
porccupine rim
Duration Product Used:
6 months
Price Paid:
$13.00
Purchased At:
pricepoint
Strengths:
I like the adjustable spring tension.Works great in a dry climate.
Weaknesses:
It would never work on my Jekyll just due to desing.You need a pretty conventional rear triangle.
Similar Products Used:
none
Bike Setup:
Giant 980 carbon with 3 1/4 in rear travel via an active fox Alps Big Air shock.A Judy up front with 80mm travel.All xt and xtr drive and shifters.
Bottom Line:
I ride in a very dry climate,and the thing works fine.I haven't used it on any really gnarly trail yet but it works as intended so far.I've see reviews that make it sound like a bad idea for mud,so take note.Kinda looks cheesy.
Value Rating:Overall Rating:
Submitted by
Tim
a Downhiller
from Tahoe, CA. USA Date Reviewed: February 11, 2003
Duration Product Used:
Less than 1 month
Price Paid:
$13.00
Purchased At:
Pricepoint
Strengths:
Damn cheap...seriously wondered if it would work at that price. Seems to be holding up so far and haven't lost my chain yet...I think I got my $13.00 worth!!!
Weaknesses:
Had to replace pretty much all the hardware that it came with. I replaced the stock nuts with self-locking nylon nuts and had to get longer bolts for my chain-stay...why didn't it come with longer bolts? Who has a bike with that narrow of a chain stay that the stock bolts would fit on? Took a while to get it setup right and a lot of patience...
Similar Products Used:
Not in that price range!!!
Bike Setup:
Schwinn 4-Banger, Stylo Team Cranks, XTR drive 9-speed (2x9), Boxxers, Hayes Hydras...do you really care what I have?
Bottom Line:
Well worth the $13.00, despite all my whining about having to go to Home Depot for the bolts and such. I go to Home Depot weekly anyhow, this was just another excuse. I've spent more on crappy lunches than I spent on this...it's not bad and I would have to recommend it to anyone with more patience than I to put it on!
Value Rating:Overall Rating:
Submitted by
bOOnie
a Downhiller
from Sydney, NSW, Australia Date Reviewed: November 22, 2002
Duration Product Used:
2 Years
Price Paid:
$95.00
Strengths:
Piss easy to set up, you whingers are softer than your mum. Stops slapping chains, holds it on in the roughstuff
Weaknesses:
Needs a few mods (change the bolts, use 2 nuts on each locks them up) Regular service, use bearing grease (lasts a few months before the wheel seizes)
Bottom Line:
Good product if you have the patience too service it regularly. Stops slap when going over bumpy sections
Value Rating:Overall Rating:
Submitted by
Andrew
a Weekend Warrior
from UVA Date Reviewed: October 15, 2002
Favorite Trail:
Walnut Creek
Duration Product Used:
Less than 1 month
Price Paid:
$12.00
Strengths:
It stops chain suck. It looks kinda cool.
Weaknesses:
It makes noise when pedaling.
Similar Products Used:
none
Bike Setup:
Kona Caldera, wellgo pedals, Bontrager Race FS+10 saddle, Kore chain reactor, Oury grips, Cane Creek ergo control barends, Cateye enduro 2 comp
Bottom Line:
Before installing it, my chain would always get sucked off the first chainring when climbing. This sucked. Since installing it, no more chainsuck. That seems to be the entire point of this product.
Value Rating:Overall Rating:
Submitted by
mike
a Downhiller
from new jersey , usa Date Reviewed: August 14, 2002
Favorite Trail:
chimney rock trail
Duration Product Used:
Tested or demo'ed only
Price Paid:
$12.00
Purchased At:
pricepoint
Strengths:
product does work if installed properly. very cheap....
Weaknesses:
longer bolts should have been provided, doesnt fit on all bikes, have to improvise on installation.
Similar Products Used:
none
Bike Setup:
k2 2001 flyin monkey, disc front, race face DH crank and BB, race face diablo stem.
Bottom Line:
if your short on money and wants a chain tensioner this might fit you, but if you have some money to spend get a MRP or Blackspire chainguide for reliability.
Value Rating:Overall Rating:
Submitted by
M Jones
a Weekend Warrior
from MD Date Reviewed: July 29, 2002
Favorite Trail:
Avalon
Duration Product Used:
3 months
Price Paid:
$23.00
Purchased At:
CBO
Strengths:
Simplicity Value
Weaknesses:
Install Clamp
Bike Setup:
Trek 6700, Avid Mech, Air Works Fork
Bottom Line:
After reading reviews I decided to give it a try since my chain would jump off any chance it could. After about 20 min. of work modifying the clamp shape it bolted on cleanly. After adding a little Locktite red never had an issue with the reactor or the chain.
Value Rating:Overall Rating:
Submitted by
SGT. ROCK
a Racer
from Edmonton, AB Date Reviewed: April 2, 2002
Duration Product Used:
Less than 1 month
Price Paid:
$29.00
Strengths:
Seems to work Well made Fairly inexpensive
Weaknesses:
Difficult to install Chainstay clamp too narrow Supplied bolts too short Needs constant maintenance (tightenting)
Similar Products Used:
None
Bike Setup:
2002 Norco Launch
Bottom Line:
Bought this device so I could have access to middle and small rings, while tensioning the chain on big-ring DH runs. Extremely difficult to install - forget about using the stock bolts, go get a handful of longer ones before you even start. The chainstay clamp has to be mounted behind the arc of the crank arm, or you run the risk of the arm hitting the clamp. The clamp itself is too narrow - even with the bolts tightened to within a hair of thread failure, the clamp rotates on the chainstay.
This device works on the bikestand with the bolts tightened, but if the chainstay clamp/pulley arm fixing bolt loosens, or the clamp rotates on the chainstay, shifting the chain to the big ring will push the pulley arm out into the crank arms' path, crushing the arm between the crank and frame. Ouch.
Bottom line - this unit is okay for DH racing, where you check your bike after every run, but not for everyday use. Too bad - with a little more engineering, it could be a winner.
Value Rating:Overall Rating:
Submitted by
ferday
a
from canada Date Reviewed: February 6, 2002
Favorite Trail:
toothless
Duration Product Used:
1 Year
Price Paid:
$20.00
Strengths:
works well, cool noise (i like the noise...)
Weaknesses:
SO REALLY HARD TO INSTALL, instructions or not, this took awhile...
Bike Setup:
2001 pipeline
Bottom Line:
the damn thing works great, does what it is supposed to do, but so hard to install. it does work with every bike i've ever seen, may need some mods (longer bolts, piece of wood etc.) but it is cheap and works!
Value Rating:Overall Rating:
Submitted by
doug bailey
a Cross Country Rider
from riverside, ca usa Date Reviewed: December 27, 2001
Favorite Trail:
as long as im riding
Duration Product Used:
Less than 1 month
Price Paid:
$25.00
Strengths:
Looks cool, works, simple.
Weaknesses:
Havnt found one yet
Similar Products Used:
none
Bike Setup:
Fisher Hookooekoo converted to single speed, RS 98 Judy SL. 38t Chain ring with redline crank arms, 17t rear sproket.
Bottom Line:
I use this product for single speed conversion. It mounted in 5 minutes, and stayed tight with piece of rubber wrapped around the chainstay. I slightly modified it by flipping the guide upside down so that the chain was pulled away from the chainstay, then I increased the tension to the max setting. I positioned it so that it was slightly closer to the rear cog. The chain nice and tight and hasnt derailed yet. It was hard to find to find chain tensioners at the bike stores, I guess they are not really in demand. I didnt want to use the derilure (not sure how to spell) because it doesnt look clean. Good for single speed conversions.
Value Rating:Overall Rating:
Submitted by
Craig Fulton
a Cross Country Rider
from St. Petersburg, FL Date Reviewed: October 23, 2001
Favorite Trail:
Santos/TOS
Duration Product Used:
Less than 1 month
Price Paid:
$15.00
Purchased At:
PricePoint.com
Strengths:
Works well once installed with a 200 lb. impact screw driver. Just kidding...
Weaknesses:
Hard as a mofo to install and get right. Makes a little noise.
Similar Products Used:
None
Bike Setup:
Fisher Sugar, Race Face, Cane Creek, XT, etc.
Bottom Line:
When I first installed this I was going to kill someone or the chain reactor. It wouldn't fit around my rear fork, but I really wanted it on there. So I drilled a small hole through the frame and mounted it directly to the frame. It didn't work at first; kept making the rear and front derailleurs jump gears. I cursed, threw tools, and the reactor. The next day I signed on here and noticed people said to get it very tight. I went back to the bike tightened the screw through the frame into the reactor as tight as it would go. Works great now! A little noisy, but worth it.
Value Rating:Overall Rating:
Submitted by
Michael
a Weekend Warrior
from Sherman Oaks, CA, USA Date Reviewed: October 22, 2001
Duration Product Used:
6 months
Price Paid:
$30.00
Strengths:
worked great
Weaknesses:
hard to install
Bike Setup:
giant ac2 with junior t ...
Bottom Line:
If you can't install it just be honest and go to the shop like I did. I paid an additional 10 in labor to have him wrap the lower arm in an old bike grip and use longer screws (applying his knowledge to the problem) and it worked GREAT. Just ripped it off the frame on a huge rock this weekend but up till then it's worked wonderfully (tore the chain in half and almost broke the frame if that helps). I am buying a replacement kore reactor as I use three gears + outside bash guard and love to jump off stuff. This chain tensioner when installed correctly works just great. Honestly what are all the other great choices? Looked to me like the MRP Recon was $120 and I lost my big gear. Seems like some of you didn't get it installed right. That's a bummer as it does work just killer like you thought when you purchased it......the application just wasn't correct.
Value Rating:Overall Rating:
Submitted by
Tom
a Cross Country Rider
from Waterloo, IA, USA Date Reviewed: September 11, 2001
Favorite Trail:
Powerline
Duration Product Used:
Less than 1 month
Price Paid:
$16.00
Purchased At:
eBay
Strengths:
Laser-etched logo, WAY cooler than derailleur-type tensioners, simplicity of unit
Weaknesses:
Noisy, despite Kore's claims of quietness due to neoprene wheel. Neoprene maybe, quiet...NOT...will hafta try the inner tube trick from below. Tough to get in the right spot. Not much clearance from 1.9 Specialized Team tire.
Similar Products Used:
Shimano Altus Shimano LX Shimano XT
Bike Setup:
1990 Trek 930...single speed. Fully rigid, OLD school DiaCompe canitlevers (from about 1985-MAFAC style), LX hubs/el-cheapo, double-wall Weinmann rims, some rubber thrown on for traction, LX cranks. I have two setups...36/17, and 32/15.
Bottom Line:
I bought this for a single speed conversion on a frame with vertical dropouts. I had used all of my spare derailleurs and was not satisfied with them, maybe because of the 'geared' look it added to the simplistic SS. It took quite a time to find the best spot for mounting, then it hits the chain a little off-kilter. It is rather loud, when compared to a derailleur. I find this product to work very well on this pretense...since it 'tightens' toward the chainstay, you MUST already have your drivetrain adjusted almost perfect...for a SS anyway. It will NOT adjust for a longer chain like a derailleur-type chain tensioner, at least for a SS. I think that it works fine for me, and no one who rides a SS around here has one, so there is always a fanfare of 'does it work?', 'cool tensioner', 'why only one speed'. If you can buy it for less than the $39 MSRP, buy it, you'll like it.
Value Rating:Overall Rating:
Submitted by
paul cotter
a Cross Country Rider
from seattle, wa, USA Date Reviewed: September 8, 2001
Favorite Trail:
the secret trails at tiger!
Duration Product Used:
3 months
Price Paid:
$13.00
Purchased At:
pricepoint
Strengths:
Cheap and lightweight
Weaknesses:
Probably has to be modified for just about everyone's bike
Bike Setup:
Random GT hardtail, XTR shifter/brake levers (gotta love good brakes), XTR/XT drive, storm control rear tire for all the damn rain we get here, blah blah
Bottom Line:
This product works. If you have half a brain, you will realize that MOST of the bad reviews this product has received are either from people who did not read or comprehend the installation instructions (check out the kore website--there are even pictures, dood) or complete idiots. (remember i said most) Some modification will probably be necessary--i just had to get longer bolts. I am a pretty avid XC rider, and i take the bike out about 3 times a week and thrash on it. I regularly take 3+ foot drops with this product, and it has never failed to retain my chain through all the trauma that would previously drop my chain to the inside about 5 times every ride (yeah, my front derailleur was adjusted correctly)and it really quieted my chain down. For the weight and price, this product rocks! If you have a really fat chainstay though, or are a 7-foot-drop downhiller, you might want to stay away. Too bad the clamp isn't universal, but maybe that'll be next year's model... Just uh... like remember to put thread locker on all the bolts--like the instructions say--duh. Since this product has taken so much bashing, and i love it so far---i give it a perfect 5. So there.
Value Rating:Overall Rating:
Submitted by
Eric
a Cross Country Rider
from NC Date Reviewed: August 31, 2001
Duration Product Used:
3 months
Price Paid:
$9.00
Purchased At:
ebay
Strengths:
previous review
Weaknesses:
will not fit all bikes
Similar Products Used:
none
Bike Setup:
dbr v-link (x-chain slapper)
Bottom Line:
I'm back with my second review! Its still working great! I havent even had to adjust it and my bike has been to hell and back, just bought another one on ebay for $8.50 just in case this one breaks. I now believe this is a must have product! This product will continue to get bad reviews because it will not fit all bikes. This product is sold to anyone thats willing to pay no matter what bike they have.
Value Rating:Overall Rating:
Submitted by
Jason Glaspey
a Downhiller
from Eugene, OR Date Reviewed: August 12, 2001
Favorite Trail:
Hardesty
Duration Product Used:
Less than 1 month
Price Paid:
$20.00
Purchased At:
Ebay
Strengths:
It held the chain tight, but not for long.
Weaknesses:
Kept coming loose. Didn't fit my chainstays very well. While I was trying to tighten it down to keep it from twisting, one of the bolts broke. An over-all pain in the @ss!!
Similar Products Used:
Still trying to find an affordable multi-chainring tensioner.
Bike Setup:
Rocky Mountain hardtail, HS-33, Alex rims, Z3 QR20.
Bottom Line:
I really wanted this to work because I couldn't find another tensioner or guide that worked with a double ring up front (two rings and a rock guard). I guess MRP is making one now, but it is over $120, and that's more than this college student has. But never in my life have I fought a component like this one. It never was aligned right. The bolts never stayed tight, and then the thing broke. Looking back, it was a blessing that it broke because I could quit messing with it. My new bike is an Azonic DS-1, and the chainstays are way too big for it, so unlike KORE says, it won't fit every size chainstay. Overall, I wish I hadn't ever seen one.
Value Rating:Overall Rating:
Submitted by
Nick
a
from Tempe, AZ Date Reviewed: August 8, 2001
Duration Product Used:
3 months
Price Paid:
$19.00
Purchased At:
supergo.com
Strengths:
Really does help chain slap. I use it on my stock trials bike, so I don't shift much and can't vouch for that. But it does keep the chain tight.
Weaknesses:
Chain guide wheel is noisy, despite Kore's claims. I tried the tip mentioned below, and put a section of a road bike tube around the wheel, now it's totally noiseless. Put locktite on the bolts, otherwise this thing will slip all over. Doesn't totally eliminate chain slap.
Similar Products Used:
Really short chain(?)
Bike Setup:
Planet X Zebdi stock trials.
Bottom Line:
Good product. If you can get it for $20 or less it's worth it. One downfall is that there's that much more to bash when you screw up a sidehop. Forgetting this was installed, I landed directly on mine on the first ride. Bent the b'jeezus out of it. However, I got home, took it apart, bent the cage arms straight in the vice, put it back together, and it's running just fine. Plus now it looks nice and broken-in.
Value Rating:Overall Rating:
Submitted by
Vince Bogli
a Cross Country Rider
from NJ Date Reviewed: July 17, 2001
Favorite Trail:
Hartshorne
Duration Product Used:
Less than 1 month
Price Paid:
$35.00
Purchased At:
Cambriabike.com
Strengths:
I don't know yet.
Weaknesses:
Everything you read from this review really tells you the majority of the installation. It doesn't matter if you have the round, square or triangular bar, installing it just does not work. Bolts are short and hex hole is weak. To the KORE company I hope you read all these reviews to make the product a whole lot better
Bike Setup:
Univega DS900 XTR compnents, W420 FIR Rims, Easton VRS DH magnesium, Thompson seatpost, Easton monkey lite CT2, Kenda Kharisma Crystal, Chris King headset, Marzocchi Z1 Bomber.
Bottom Line:
I was expecting a little bit more from KORE. I guess no one really is perfect. I would suggest to check all the reviews of any parts anyone would like to buy first before actually getting it.
Value Rating:Overall Rating:
Submitted by
Alex Yep thats right
a Weekend Warrior
from Sydney, Australia Date Reviewed: July 7, 2001
Favorite Trail:
dont have one
Duration Product Used:
6 months
Price Paid:
$15.00
Purchased At:
cant remember
Strengths:
it'll last a while but remeber to tighten the bolts it does stop some chain slap but it chipped the frame
Weaknesses:
IT FELL OFF
Similar Products Used:
TRUVATUV CHAIN GUIDE
Bike Setup:
Kona stinky 2001,8 inch hayes front, azonic stem bar, dmr v8 pedals , marzocchi jr T xt rear derailer and a truvativ chain guide
Bottom Line:
it was good till it fell off
Value Rating:Overall Rating:
Submitted by
Angel Franco
a Downhiller
from Sea Ranch Lakes, FL, USA Date Reviewed: June 22, 2001
Favorite Trail:
Snakebite
Duration Product Used:
Less than 1 month
Price Paid:
$15.00
Purchased At:
Pricepoint
Strengths:
More more chain slap and unwanted shifting on the rear cogs.
I think the Chain Reactor is a must on all hardtails. It totally eliminates chain slap and unwanted shifting due to riding fasr over roots. It doesn't come with directions because the directions are on the Kore Products web sight. You can get the get through MTBReview. Before you install it you have to do a few things first: 1) Make sure you drive train is perfectly tuned before you intall the Kore Reactor. 2) Go to your nearest hardware store and purchase longer bolts, locktight(threadlock), and some bearing grease. 3)Grease up the guide wheel's axle and spring to keep sand out. Then apply locktight to all the threads on the bolts. 4) Don't forget to pre-stretch the spring before you install it. The chain guide has a sweet spot and its differnt on all bikes, so you might have to try different posistions to get it right. Once it is on right to should be able to shift through all gears without any problems. The other guys who said this product wasn't worth it probably installed it wrong on thier bikes. This Product works. If you have no idea on how t install it and you have already read the directions on how to install off of the Kore website, then just take your bike to a bike shop and have them do it for you. I'll again again in a couple months to update the chain guide.
Value Rating:Overall Rating:
Submitted by
Eric
a Cross Country Rider
from N.C. Date Reviewed: June 11, 2001
Duration Product Used:
Tested or demo'ed only
Price Paid:
$15.00
Purchased At:
price point
Strengths:
no chain slap, cheap price
Weaknesses:
The bolts are weak, will not fit all bikes. You can here a slight buzz but it is very faint. Should have lock washers on the pulley. It came without instructions.
Similar Products Used:
none
Bike Setup:
98 DBR V-link, pc89, xtr der.,race face rings
Bottom Line:
Ok, I read all the horror stories and thought no product could be this bad. This thing will not fit all bikes, so check first before you buy. Installation was easy if you use common sense and know how your bike works in the first place, with that said you could still have problems but I think it is worth a try. When I first looked at it I knew I had to change the bolts to stronger and longer ones, also thread lock made sense too. I still use a lizard skin by cutting in the middle of the velcro part so it covers the clamp. I put this on in a way that if it does get pushed into the wheel it only hits the rim with the rubber chain guide. So does it work? Yes!!! Perfectly!!!! I have to say I have only flogged this thing on one ride but I couldn't get it to mess up. If it gives me trouble I will simply undo the chain at the power link (Sachs chain) and bypass the thing then toss it in the garbage. I will report back if this thing doesn't last (durability could be an issue). Buy one and hope it fits, dont overpay they can't give these away. _1 chilis for the cheap bolts
Value Rating:Overall Rating:
Submitted by
Jon
a Cross Country Rider
from tulsa, ok Date Reviewed: June 6, 2001
Favorite Trail:
turkey mtn area
Duration Product Used:
Less than 1 month
Price Paid:
$20.00
Strengths:
Laser etched graphics :)
Weaknesses:
Clamp, Wheel not wde enough/not enough side to side play, bolts are weak
Bottom Line:
This product is crap. Chain would not stay on wheel when in highest gears or lowest gears even after frequent adjustment. Caused chain to pull into der cage.
DONT BUY THIS THING, Im glad I didnt pay much for it.
Value Rating:Overall Rating:
Submitted by
Sean
a Weekend Warrior
from Boca Raton, FL, USA Date Reviewed: May 23, 2001
Duration Product Used:
Less than 1 month
Price Paid:
$35.00
Purchased At:
Tropic Bike
Strengths:
Easy to install. No need for adjusments. No Chain slap or derailment when riding up stairs.
Awesome product. I read all the reviews before I bought the reactor; all the horror stories are false. It took 5 minutes to install. I did put a drop of lock tite on every bolt when I installed it. I usually clean my drivetrain very well after every trail ride, but just to test the reactor, I rode it through sand, mud,water, changed gears constantly, and haven't cleaned it yet. That's 3 weeks of commuting and trail riding, and it hasn't skipped a beat yet; the roller won't stick. Anybody tired of chain slap, chain suck, or derailments should buy the reactor.
Value Rating:Overall Rating:
Submitted by
Bogus Blake
a Cross Country Rider
from Flagstaff, AZ Date Reviewed: April 11, 2001
Favorite Trail:
Schultz Creek/Sunset
Duration Product Used:
Less than 1 month
Price Paid:
$35.00
Purchased At:
Cosmic Cycles
Strengths:
no more chain slap, no more chain suck, looks cool, makes friends jealous
Weaknesses:
takes some adaptation to install on some bikes, squeeks when its really dusty
Bike Setup:
Rockhopper FSR comp, set up for freeride- XVert, XT drivetrain (LX crank: 22,32,bashring), Ritchey Zmax front tire (2.4), Specialized Big Hit pro front (2.5), kore chain reactor, flat pedals
Bottom Line:
Seriously people, once you get it set up, it is so worth it. My FSR has rectanglular chainstay, so I had to go down to the hardware store and pick up some longer bolts (4mmx.7 threads)to make it fit. Then, I put some heavy lithium grease on the bushing to keep out the dirt. Finally, I tightened down the bolt that holds the pivot. My shifting improved, and my chain has not come off either ring since I put it on. If you know how to turn a wrench, you can install this thing and have it work for you. You you may have to figure out what works for your bike, but you will be pleased. If you still cant get it to work, take it back and get a Mr. dirt or something. If you just arent capable of adapting something as simple as this, dont waste my time with a poor review.
Value Rating:Overall Rating:
Submitted by
zac
a
from az Date Reviewed: December 9, 2000
Duration Product Used:
Less than 1 month
Strengths:
none
Bottom Line:
Biggest P.O.S. I had it on my bike for a day not only was it a b*tch to mount but it snaped off within 10 minutes of my first ride with it Do not get it
Value Rating:Overall Rating:
Submitted by
Chris
a Downhiller
from New England Date Reviewed: July 15, 2000
Favorite Trail:
Mt Snow Pro/expert Course
Duration Product Used:
3 months
Strengths:
None this products has no strengths
Weaknesses:
Does the exact opposite of what it designed to do it actualy makes the chain come off
Similar Products Used:
Mrp
Bike Setup:
Gt Sts Dh with boxxer and magura brakes. XT xtr drivtrain
Bottom Line:
Dont go out and waste your money on this thing. It the worst 30 bucks ive ever spent. Im not fooling around this time im getting an mrp
Value Rating:Overall Rating:
Submitted by
Dan
a Weekend Warrior
from Dorset Date Reviewed: June 28, 2000
Duration Product Used:
Less than 1 month
Strengths:
lightweight and looks
Weaknesses:
rubbish, it broke on the first ride I used it, skinny build, flexy, couldn't get spare parts for it and so had to chuck it away!
Similar Products Used:
DCD
Bike Setup:
GT Avalanche, Judy 100's
Bottom Line:
It was crap, and a complete waste of £30.00, should've kept to a simple design like the DCD. I am never going to buy another Kore product again!
Value Rating:Overall Rating:
Submitted by
Peter
a Cross Country Rider
from Sacto. Cal Date Reviewed: June 8, 2000
Duration Product Used:
3 months
Strengths:
Sorta works
Weaknesses:
When you lube your chain the lube gets on the wheel and instead of spinninig the wheel the chain just glides over the wheel creating drag.Doesn't keep chain on rings. A b!tch to set up. has to be perfect.
Bike Setup:
rockhopper, judy, 8 speed,
Bottom Line:
It tensions the chain but doesn't solve any problems. Doesn't keep chain on rings. it sorta works
Value Rating:Overall Rating:
Submitted by
John
a Weekend Warrior
from Taylors, SC Date Reviewed: May 26, 2000
Duration Product Used:
Less than 1 month
Strengths:
Looks Cool Best Paperweight I own
Weaknesses:
It Just DOESN'T Work
Bike Setup:
KONA Roast, Raceface, z5 Bomber, Sunn ditchwitch, etc.
Bottom Line:
After I had already ordered the product, I thought I would see the reviews posted. Boy was I disapointed. But some had stated that it just needed some special time and items to get it to work. Not true, at least not for oval chain stays. I just doesn't work. If you can get the the thing to stay in place on the chain stay, use longer bolts, use a cut up inner tube wrapped around it, IT WILL STILL HAVE PROBLEMS. It will rub on the tires, or the back of the crank arm. Please DO NOT buy this.
Value Rating:Overall Rating:
Submitted by
tim
a Weekend Warrior
from cincinnati, ohio Date Reviewed: December 5, 1999
Duration Product Used:
3 months
Strengths:
nice machining
Weaknesses:
-flanges on pulley are so short that the chain constantly jumps off -rotates freely on chainstays
Similar Products Used:
dcd tensioner
Bike Setup:
litespeed obed w/ halson pds fork
Bottom Line:
crapola. worthless product. i got mine used for eight bucks. i'm selling it.
Overall Rating:
Submitted by
Aaron
a Weekend Warrior
from LA Date Reviewed: November 30, 1999
Favorite Trail:
Aptos CA
Duration Product Used:
6 months
Strengths:
No chain slap, keeps the chain from going into the BB piviot on a LTS.
Weaknesses:
Biggest pain in the ass to keep adjusted. like everyone else Ive lost several bolts myself, and yes the wheel doesn't spin after it gets dirty!?!, sound strange on a MTN bike eh! I usually end up taking it off during rides longer than 10 miles. Some times it simply comes off by itself (bolts).
Similar Products Used:
Ill let you know what I find
Bike Setup:
GT LTS (97)
Bottom Line:
Don't buy it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! IT's only good if it's free or if you actulally like adjusting thinkgs on your bike while your friends complain for you to hury up!
Overall Rating:
Submitted by
cohiba (the kamikaze dude)
a Weekend Warrior
from Singapore Date Reviewed: October 26, 1999
Favorite Trail:
Mt. Bromont, Que. Canada
Duration Product Used:
2 Years
Strengths:
Relatively light weight, strong spring It's a KORE product
Weaknesses:
Weak bolts, flimsy design, Urethane pulley seizes and doesn't move. Doesn't fit on all chainstays.
Similar Products Used:
DCD Mr Crud chain tensioner.
Bike Setup:
GT STS-1000DS w/ Marzocchi Bomber Jr.T.
Bottom Line:
I bought this a while back because I thought it would be good since it's a KORE product. And usually, KORE products are good. But not in this case.Whilst installing the Chain Reactor, one of the bolts broke off on me. So I wrote to Kore, and within a few weeks, they had shipped me a new set of stickers and bolts. That was good customer service on their part, no doubt about it. Using the chain reactor was ok, although I did notice that once the urethane pulley was covered in chain oil, and road grime, it didn't turn as much as it did when it was new. As a result, the chain was being pulled over the pulley without making it turn. This caused a groove to form in the pulley, making it virtually useless from that point onwards. The chain reactor did cause some shifting problems, simply because the width of the pulley was not enough to cover the shifting range of my bike. Kore should make this wider to accomodate more chain positions. Also, the chain reactor was quite prone to being hit (especially when pedalling), and could be pushed into the tyre's path. Overall, not worth getting since there are better tensioners out there, and a bit expensive considering the performance. Kudos however to KORE for the great customer service.
Overall Rating:
Submitted by
Tristan
a Cross-Country Rider
from Pullman, WA Date Reviewed: June 24, 1999
Favorite Trail:
Lots of em'
Duration Product Used:
tested or demo'ed only
Strengths:
Not many... it looked cool! Mabye it worked...
Weaknesses:
IT DOESN'T FIT CANNONDALES. I tired to put it on with my Lizzarrd Skins on and off. It just doen't FIT
Similar Products Used:
Others...
Bike Setup:
a Cannondale F900 with no stock parts on it (besides the frame)
Bottom Line:
It Really sucked becuase it looked cool but wouldn't fit. It looked like it would work well. They need to rethink thier design cause it installs really funny!
Overall Rating:
Submitted by
JUSTIN
a Cross-Country Rider
from SALT LAKE CITY, Utah Date Reviewed: May 20, 1999
Favorite Trail:
Summit Trail, (Nephi)
Duration Product Used:
more than 3 years
Strengths:
NONE
Weaknesses:
DESIGN,installation, Application
Similar Products Used:
Daves, Tektro, MSR,
Bike Setup:
XTR FSR S-Works
Bottom Line:
Don't waste your time, I have tried it on 3 different bikes w/ the same results. The Damn thing just does not work, it is not advanced enough for downhilling, and too poor of a design for trail riding. Kore sayes it should work in all three chainrings-------- it doesn't, Hell I chain suck more w/ it. Half of the time it is rubbing on my tire the other half it is clanking the Crank arm with every stroke. DON'T WASTE YOUR MONEY<<<<<<<<<<<<< unless you want a cheap black one (smiles) If possible I would give this the same stiff I give shitty waitresses 00000000000
Overall Rating:
Submitted by
voodoo-1
a Cross-Country Rider
from Alexandria, VA Date Reviewed: April 2, 1999
Duration Product Used:
1 Year
Strengths:
Does what it's supposed to do.
Weaknesses:
Slows the rear shifting on the weak spring havin' XT deraillers.
Bike Setup:
Dagger Elan H/T XT deraillers, RaceFace cranks/rings.
Bottom Line:
It's a good idea, just needs some fine tuning. Does the job it's supposed to, but not exactly how it's supposed to (that wheel rolls for about a week. . .but it still keeps the chain from slapping/sucking/dropping). Kore is good about getting you new bolts because they will strip VERY easily (I think they figured this out and send you better/stronger ones with no prob). Loctite the screws into it, or they won't hold. If you can, clean the wheel as much as you can, because any goop that gets in it is going to make it stop rolling. Also, from what I hear, take a piece of a road bike tube and place it over the wheel. . .and that will allow it to catch and roll.
Overall Rating:
Submitted by
Tom Walsh
a Cross-Country Rider
from Seymour, CT. Date Reviewed: March 22, 1999
Favorite Trail:
Case Mountain manchester Ct
Duration Product Used:
3 months
Strengths:
looks/idea
Weaknesses:
from the time you fork over the cash.
Similar Products Used:
still looking
Bike Setup:
95 Kona Explosive. White Bro.s sc70 full XTR
Bottom Line:
Should be called the Chair DEactor! I had installed a brand new sachs chain 3 weeks before I purchased this product and my shifting had been clean and sharp. I hated chain slap I like quiet ride so I picked up the reactor. I got it home and tried to install it. I had problems right from the start. The Kona has an ovalised tapered chainstay. to keep the reactor tight I had to wrap the chainstay with an old tube to thickin it. Now you have to tighten it down! you better be right were you want it cause the bolds strip REAL easy. You have a three inch spacing to choose from. no closer that 1 to the crank and no farther than 3 from the crank. I tried all positions NO shift improving and sometimes this product accualy caused the chainsuck. I have been doing all my own work on my bike for as long as I have been riding and Have never had a problem with anything I have done. I do have to say it did quiet my ride and reduce slap when it did work. I am very open to suggestions and will give this product a fare chance but so far NO good! I will give the reactor 2 chillies for now because I think it has the potential to be a good product but needs some work.
Overall Rating:
Submitted by
Jamie
a cross-country rider
from Boston Date Reviewed: February 4, 1999
Bottom Line:
Had one for two years now and it does work, sorta. First, it DOES fit oval chainstays - just not all. This is a good reason to pay en extra $5-10 at the LBS, you can check it out BEFORE you buy. I did have problems installing due to a soft alloy clamp, hard steel bolts, and huge chainstays. KORE happily gave me a new (mismatched, hehe) clamp - when I finally ran down a rep at Mt. Snow. OK, so you have the sucker clamped on and you have that pivot problem.... Me too sometimes but I do NOT use lock tite, just torqued the shiite out of it and I have had no problems when riding, usally it moves because I hit it loading it onto a car rack... It does NOT improve shifting, in fact expect shifting on a triple crankset to be SLOW. I have not lost a chain, had chainslap or chainsuck though in two years. Which is its job, so overall if you need a tensioner and you have some (a lot) of patience it is a good choice... I guess.
Overall Rating:
Submitted by
TV
a cross-country rider
from London, England Date Reviewed: January 12, 1999
Bottom Line:
This thing doesn't work, can't get to sit straight on the (oval) chainstay. Shift quality deteriorates and when it gets knocked moves into the path of the crank. No amount of locktite solves that problem. Deeply dissapointed that I paid $49 dollars for it....
Overall Rating:
Submitted by
Joe from South Jersey
a weekend warrior
from NJ Date Reviewed: December 5, 1998
Bottom Line:
Very disappointed. Tried to set up on a Turner Full Suspension. Ruined my shifting quality. Should be used on down hill rigs only. Not with triple set ups. I'll give mine away.
Overall Rating:
Submitted by
Brian Manson
a racer
from Secaucus, NJ Date Reviewed: July 7, 1998
Bottom Line:
I have had a Kore Chain Reactor (also see Kore chain tensioner review) for over a year now with no problems at all. I don't know what these asswipes in this reveiw are talking about, but maybe they are competitors of Kore. This chain reactor rocks! You must lock tight the nuts to stop the risk of the bolts backing out. And yes I do have it mounted perfectly on an oval chainstay without any problems.It is really smooth and does improve my shifting like they said it would. To all you idiots on this review, have a trained mechanic set you up. I give five chilis for an excellant design. Great work Kore!!!!!!
Overall Rating:
Submitted by
gomer
a racer
from westsIIIde Date Reviewed: June 27, 1998
Bottom Line:
god DAMN! this american peice of shit, sucks! it doesn't work on my Klein chainstays! those stupid idiots. oh yes it works on all cheainstays go to hell kore sucks! heavy, over rated, corperate crap! MAN that makes me P'Oed! AaaaHHHHHHHHHHHHHHHHHHHHHHHHHHHHHGH la la la la la flf dlf dkd dkdf kf dkjf ffkj d f k, dsfk f kf dk fkore lksdf fkd fk fk kf klkasdf lchain lksdfj dk dfkchain sdk dk stuffkd f d dfksuckssdflk ~~!!! fkgjma
Overall Rating:
Submitted by
Michael
a weekend warrior
from Costa Mesa, Ca. USA Date Reviewed: May 11, 1998
Bottom Line:
Class A Crap. Will not install on any oval chainstays, (Tried on three). To make it work on oval tubing had to fabricate my own bracket. After installation. Never did function quite like I would like it to. Ended up returning. Anybody have any recommendations for a descent tensioner that will work on oval tubing???
Overall Rating:
Submitted by
tev
a racer
from miami, fl Date Reviewed: May 1, 1998
Bottom Line:
BEWARE: This piece of MIERDA will not install on rectangular or oval chain stays like the ones on Cannondales and now I have to return it and paid double shipping because the dumb ass salesman nor the product warn about such LIMITATION of the product. It is not like cannondale is a rare bike... a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
Overall Rating:
Submitted by
Allen
a weekend warrior
from HP, IL (Chicago area) Date Reviewed: April 7, 1998
Bottom Line:
Kore is nice. The pivot @ the bottom of the clamp needs loc-tite. Other than that, the sucker works AND it's super silent in any terrain. Also, I haven't had a chain suck ever since I put it on! Kore needs to limit the pivot to something like 10 degrees ... enough so it won't go into the spokes and yet away from the cranks. If that is resolved, it would be the best tensioner (it really still is).
Overall Rating:
Submitted by
Tony Smith
a downhiller
from Bozeman, Mt Date Reviewed: February 11, 1998
Bottom Line:
Kore's tensioner works great if you keep the clamp bolts and pivot bolts tight (I'd loctite the damn things!). The pivot bolt that gave Billy problems is NOT supposed to pivot after you align the tensioner. It must be kept tight or you will suffer the same fate! Also, the clamp doesn't fit all frames...but email me with your chainstay dimensions and I may be able to make a clamp for you. I had to make one to fit the oversized rectangle chainstay on my Titus' rear-end.
Overall Rating:
Submitted by
Billy Goodman
a cross-country rider
from Tucson, Arizona Date Reviewed: January 7, 1998
Bottom Line:
Chain Reactor a chain tensioner from KORE. Looks good in the advertisements and I needed a chain tensioner. Purchased one for approximately $33.00. Installation is fairly simple, the Chain Reactor does require a careful placement and alignment. It worked great for the first 100 lightly terrained miles. Then the Chain Reactor snapped when I took my rig on rough rocky terrain. Unlike other chain tensioners, the Chain Reactor is pivoted and in the direct path of the crank. This design is destined to have the same results I experienced today. My recommendation is to use a chain tensioner which is stationary or mounts out of the way of cranks. Sorry KORE, better luck next time.
Overall Rating:
What's New
»
BEST OF MTBR - Check out the highest rated bikes, parts, & gear!
»
LED BIKE LIGHT SHOOTOUT 3 - We test all the newest products and latest light and battery technology in this comprehensive guide»
$
Overall Rating:
Overall Rating:
Overall Rating:
