FOX patented TerraLogic technology distinguishes between rider induced forces from above the bike and bump induced forces from the ground. The inertia-valve then chooses between ultra-fast lock-out mode and glued-to-the-ground traction mode.
from Kirchheim Teck, Germany
Date Reviewed: April 21, 2007
Strengths: No fuss, just ride and ride
Weaknesses: After one season the seals are now leaking from the top on both sides. This sucks and it is not so good for my disk brakes either. I have yet to repair them after a few weeks on the trails.
I like the shocks but I do not like this kind of hassle. For the cost this should not happen. I have never had cheap shocks that leaked!
a Cross Country Rider
Date Reviewed: October 12, 2006
Strengths: Soak up every bump in the way and locks out when it needs to. No cheap plastic used anywhere
Weaknesses: The paint is not fantastic and seems to rub off pretty easily, but thats it
Having moved from a pair of RST Gilla's on my specialized to my merida with the F80x the difference is insane. I have tried a lot of other expensive forks but these are just awesome. You never have to worry about lockout again and it is almost scary when you are sprinting and the fork is fully locked and then you hit a bump and it just soaks it up. Fully recommended for xc, would look to go to the F100x for heavier stuff though.
Favorite Trail: anything thats not the road to work
Duration Product Used: Less than 1 month
Purchased At: Cyclo Pro - South Africa
Similar Products Used: NONE.
Bike Setup: Merida Matts Pro Disc 2006. 11.9KG - awesome bike
a Cross Country Rider
from Lethbridge, AB, Canada
Date Reviewed: November 15, 2005
Strengths: No fuss, no muss, does what it's supposed to do.
Weaknesses: None that I know of.
I bought the bike at the end of June, 2003, and had the dealer install the Fox F80 right out of the box. My previous bikes were all non-suspension, so this was quite a transition. The inertial valve front and rear suspension made this transition totally painless. I now have 4200 km. on the bike and ride everything except wet, and I've had zero problems. It rides like a rigid bike until the bumps show up, then the suspension kicks in and smooths the trails. The fork is practically invisible - it does its job and makes no fuss, and I don't have to putz around with lockouts. Being a suspension newbie I was a bit intimidated at the thought of trying to adjust the suspension to suit my style, but the adjustments are easy. It took about 1500 km. to break the fork in. The result is a fork that is butter smooth on the rough, and doesn't bob and waste my energy. I'd recommend this fork to any XC rider. It's pricey, but you get what you pay for with this fork. On a cost-per-grin basis, I'm well ahead!
a Weekend Warrior
from Gallup, NM, USA
Date Reviewed: November 4, 2005
Strengths: 1) Terrain-reading inertia valve / automatic lockout 2) Bump compliance/sensitivity near infinitely adjustable with 22 clicks (settings) + usual air spring adjustability 3) Unmatched quality (all metal, no plastic) & beautiful 4) Absolutely zero flex (stiff, 32 mm stanchions)
Weaknesses: None (cost doesn't count--you get what you pay for)
The first time you ride a Fox Terralogic fork, you will just not freakin' believe it: it is absolutely, stunningly unbelievable. Fully locked out on climbs, but still responds to bumps instantly. Call it the first psychic / clairvoyant fork ever made. Smooth and supple, it takes the hits, and has 22 clicks to dial in the bump compliance (plus the air pressure is set to ~50% of rider weight to individualize; compression damping is factory set).
I've read the reviews about blown seals but I've had no problems whatsoever. Zero. Zip. Nada.
The only conceivable reason everyone to complain is the price (MSRP $775--ouch!), but as with a lot of things, you get what you pay for. I got a ridiculously good price for a used F80X on Ebay, but having ridden one, I would easily pay full price, the fork is that good.
I ride epic Southwest desert singetrack (loose & steep, lots of climbing and descending, but no real drops over 1-2 feet) and this fork is dead-on perfect. Why fool with a lockout when this fork does the thinking for you? I will never ride anything else, ever.
Similar Products Used: Rock Shox (various); Manitou (various)
Bike Setup: 2003 Fisher Sugar 3+ with Avid SD-7s, King headset, Time ATAC pedals, Kenda Nevegal 2.1's
a Cross Country Rider
Date Reviewed: August 20, 2005
Strengths: tracking - stiff, very little flex. Lock out valve when working. customer service has been good - but I hope they have a new design for the parts they are replacing.
Weaknesses: seals, sub assembly - I have two of the 80x and cannot get the seals to last more than 5 rides or 100 miles...Just killed another set of seals(5 sets in 7 months) right after the 24hr race at hurley creek. There were 3 other racers at the mavic booth with issues of their forks leaking there as well(mavic was offering free tech support for all bike racers). Worst part, I only rode it for two laps and switched bikes...
Now – I have already sent my two forks in for warranty 2x each, and the first one is almost ready to go in again. But are there any part updates? Should I send it in again only to get the same parts put back in and have it last 2-3 rides?
My diagnosis: it seems like they used the same seals on this fork as they do for all the other forks. And when the terralogic is engages its putting more pressure on the seals and causing them to leak within a few good rides for me. And I only weight 165 and I always keep good air pressure in the shox. At this point, I'm considering just letting the oil run out on the next leak until the new 2006 forks come out. On paper, this fork is the best out there and the customer service has been great, but I’d really like to not know my repair man for a front fork.
Similar Products Used: Ronin 80 mm 2004 3 months Rock Shox SID SL 2002 2 years
Bike Setup: Principia MSL Pro 2004 / weels chris king+ Mavric X517 / Brakes HS33 2005 /Stem Thomson Elite 120 mm 5" /Seatpost Thomson Elite / crank XTR 2004 / Cassette XTR 11-32 / Chain CH 7701 9 Speed / Pedal Time ATAC XS Ti Carbon / Derailleur back X.O front XTR / Shifter X.O /
from Takoma Park, MD, USA
Date Reviewed: November 22, 2004
Strengths: TerraLogic, precise steering, plush feel, very tunable, easy to work on
Weaknesses: Seals leak and require frequent replacement at $20 a pop shipped from Fox
The fork performs great, no doubt about it. It has a great feel and the steering is very precise. The TerraLogic thing works as advertised: plush suspension when you want it and a rigid fork when you don't. It is a great fork for a single speed because it does not move when you are standing and hammering unless you are on something bumpy.
However, mine has leaked oil big-time. I do the seal maintenance like the manual says, but I'm now on my third set of seals. The originals leaked after about 20 hours, so Fox hooked me up with a second set. That set lasted maybe 60 hours, now a third set has started leaking already after 3 rides (6-8 hours). I understand it is a wear item, that I ride a lot more than most riders, and that forks need maintenance, but I think 3 set of seals in 9 months (since mid-Feb.) is excessive. The fork performs so well that I'm willing to put up with it in the hopes that maybe Fox will eventually come up with seals that are more durable. However, it is kind of a PITA, especially for such a pricey fork. Even though the seals leak oil, there hasn't been any dirt underneath them when I've pulled them up, and the oil has not appeared to be contaminated when I've pulled the lowers off to replace the seals, so I guess they are doing the job, leaky or not.
I give it a 3 for value because of the seals, and a 3 overall. Performace is excellent, but having to replace the seals all the time is a bummer. Fork seals should last longer than a chain.
Similar Products Used: Marzocchi X-Fly 100, various Rock Shox
Bike Setup: Phil Wood KISS-Off single speed, Phil Wood hubs and BB, Race Face Turbine LP cranks, Bontrager Mustang UST rims, 2:1 gear
a Cross Country Rider
from Los Angeles
Date Reviewed: November 4, 2004
Strengths: Does what it says it will do. Subtle and smooth. Fast, good tracking.
Weaknesses: Not very responsive. Weak on quick drops, big bumps, stuff larger than my big toe. I like my '04 FOX RLC more for epic rides.
Solid for the racer on the NORBA circuit, or a rider who does less technical singletrack. I think it will improve with time. I have heard mixed reviews about it. Mine is solid and I ride hard on a lot of technical terrain so that is promising. The new technology is exciting.
I had one really ugly wreck on it and I don't think the fork was part of the problem because it was new and I was still tweaking the setup. Since then it has been smooth. The money I saved on the fork went to the doctor bills.
a Cross Country Rider
from louisville, ky
Date Reviewed: October 13, 2004
Strengths: 32 mm stanctions! This thing is super stiff.
Weaknesses: The right seal blew after five rides ;(
This fork is awesome until the seals blow. And the problem seems to be a common one. Fox was more than willing to send me new seals, but i opted to install Enduro seals. So far so good. This shock does ride quite a bit different from others, but it does what it is suppose to.
When i tore the fork apart to install the seals, i noticed a lot of wear on the internal parts. This was suprising since it had only been ridden five times. So i wonder how enduring these forks are? only time will tell.
I think i am going to check out the Fox RLT, same beefyness, but .25 lbs lighter.
Similar Products Used: Sid 100, Sid Team w. remote.
Bike Setup: Specialized epic, forx fox 80 X, xtr, sram x.0, avid titan. hugi 240 with 517.
a Weekend Warrior
from Minneapolis, MN USA
Date Reviewed: August 24, 2004
Strengths: Works as described, stiff, adjustable.
I was really surprised when I rode this fork. You hear about the technology and it sounds sweet, but I was still a little hesitant. I can tell you that the fork works as promised. It's amazing how fast it responds, you can go off a curb and by the time you hit the ground it’s completely plush. Same thing happens when you hit a root.
The bump threshold adjustability is nice feature. This fork isn’t the lightest, but is still great if you’re a racer. I think you save a great amount of energy. I’m pretty fat and slow and can use all the help I can get. This fork definitely did the trick. Also, the fork holds air like anything. Throughout the summer I had to tweak the air pressure twice, once when I got it early spring, and about a month ago.
If you can afford it, I certainly recommend it. Overall, the fork is great; price, not so much. I don’t think I would have got this if I didn’t work at a shop. Fox Forx are the best out there, but they come at a price.
Similar Products Used: Work at a shop, lots of forks.
Bike Setup: S-Works Epic FSR, XTR, Fox Forx
from Ann Arbor, MI, USA
Date Reviewed: August 4, 2004
Strengths: This fork is super plush and super stiff. The terralogic just plain works. It's almost unbelievable. Once you have it set up properly (which is really easy) it's like it reads your mind.
Weaknesses: MSRP is quite expensive, but when you take into account that no other fork on the market can even come close to the performance of the F80X, you realize it's worth every penny.
Get one...NOW! This thing is just plain amazing. You pay about a .5 lb weight penalty over the lightest forks out there, but that doesn't even matter when you realize that your efficiency goes through the roof and you don't even have to think about your fork while you are riding or racing. I don't even notice the .4 lbs extra over my old mars. Many people talk about the price as being the downside. There are other less expensive top of the line forks out there, but it's only fair that this fork should cost more seeing that it truely THE best XC fork out there. I paid $600 for mine and I think that was an absolute steal. Now that I have ridden it I would gladly pay the $775 MSRP.
Bike Setup: 2000 Trek 8500, Fox F80X, XTR/XT (Sram X.0 coming soon), Answer carbon risers, race face cranks, time peddals, Panaracer Trailblaster tires...
a Cross Country Rider
from sf, ca
Date Reviewed: June 6, 2004
Strengths: easy to set up. inertia valve works like a dream,it engaged every time hit came from bottom of shock. no bobbing from the front end. increases performance by having stiff front very noticable when out of saddle. eats up all hits very smooth.
Weaknesses: none so far.
the shock is great. i noticed a huge difference on the first ride. i works like it is suppose to engaging only from a hit from the ground. i hoped i would save a half pound or so it weighs 3.5 but i dont notice with the increase performance. also stickers peel off very easy.
Bike Setup: titus racer x 80 xtr avid disk chris king hubs
from Barrie, Ontario
Date Reviewed: May 27, 2004
Strengths: stiff, plush when activated, good looking, infinatly adjustable
Weaknesses: heavy, even on quickest to activate doesnt soak up small bumps
I have been a weight weenie for years so really had to wrestle with adding more than 1/2 lb to my bike with this fork. So far, I think it was worth it. My only comment that may be slightly negative is that the fork takes some getting used to insofar as the lockout not allowing for relatively small bumps to activate the fork-even on the most sensitive position. But thats whats to be expected- you cant have it too active if its going to lock out until its really needed. Its a "have your cake and eat it too" kinda thing. Overall, I really enjoyed the fact that it doesnt brake dive, and when you come to the bottom of a fast hill then need to turn sharp, the fork is stiff and locks out so you are not compensating for the movement of the fork. In other words, you can go way faster on this fork than a fully active fork. I'd recommend the fork for racers-its likely the best fork on the market for racing-I'd probably go with the Fox regular non-terralogic Float if I didnt race just for the extra comfort on the small hits.