BombShell Proshift Rear Derailleur Derailleur

4.53/5 (53 Reviews)
Weight : 170 grams MSRP : $99.00


Product Description

  • CNC machined from 6061 Aluminum
  • 8 or 9 speed compatible
  • All pivot points o-ring sealed
  • Colors: silver, red, blue, black, ti


  • Review Options:  Sorted by Latest Review | Sort by Best Rating

    Reviews 1 - 15 (53 Reviews Total) | Next 15

    User Reviews

    Overall Rating:5
    Value Rating:5
    Submitted by Chris Chance a Cross Country Rider from Düsseldorf,Germany

    Date Reviewed: March 7, 2006

    Strengths:    light
    good optic
    shifts very well


    Weaknesses:    expensive
    you must a little bit care of it


    Bottom Line:   
    The rear mech. shifts very well.A little bit difficult to adjust but then it works well.

    Expand full review >>

    Duration Product Used:   2 Years

    Price Paid:    $120.00

    Purchased At:   Hi Bike

    Similar Products Used:   Shimano LX,XT,XTR

    Bike Setup:   Astro [Rock Shox SID,Precision Billet,Race Face,Adventure Components,Syncros,Tune,Extralite]

    Overall Rating:5
    Value Rating:5
    Submitted by Brad a Cross Country Rider from Lancompton, CA USA

    Date Reviewed: September 11, 2005

    Strengths:    Set it and forget it.

    Weaknesses:    Takes a little more set up attention, but after that it just disappears.

    Bottom Line:   
    I used this until I switched to 9-speed and found the cage wasn't long enough for a 34 tooth cog. After my XTR wore out I made a long cage for my Proshift and put it back in service. It's the most troublefree derailure I've ever used.

    Expand full review >>

    Favorite Trail:   Any

    Duration Product Used:   More than 3 years

    Price Paid:    $75.00

    Purchased At:   CBO

    Similar Products Used:   LX, XT, XTR

    Bike Setup:   2001 Specialized Enduro Pro, XTR shifters/brakes, Stylo team cranks, Marathon S fork.

    Overall Rating:5
    Value Rating:5
    Submitted by Dennis Grunbeck a Weekend Warrior from Long Island, NY, USA

    Date Reviewed: August 12, 2004

    Strengths:    performance, strength, looks, cool factor, not ShimaNo, made in USA, rebuildable (except I wouldn't know where to get the parts)

    Weaknesses:    none that I can tell other than that they are out of production

    Bottom Line:   
    These derailleurs are the best I have ever used. They never complain, they just shift perfectly. I use metawire cables and my K2 has sachs twist shifters, and my Giant has proshift front and rear der and protwist shifters. the pb derailleurs on both bikes work awesomely in all conditions. The cable adjustment needs a little tweaking from time to time, but have not had any major problems with any of the proshift derailleurs, brakes (most powerful I have ever had and they modulate extremely well) or shifters . yes, they did make shifters for a while and they work great, except they don't have a gear readout. too bad precision billet (now bombshell parts) apparently didn't make enough money on these parts to keep them in production.

    Expand full review >>

    Duration Product Used:   More than 3 years

    Price Paid:    $100.00

    Purchased At:   Cambria/ebay

    Similar Products Used:   shimano

    Bike Setup:   k2 Oz carbon, proshift rear der, shimano XTR front der (unfortunately the proshift front der does not fit, all carbon everything including Rev X Roks wheels, Moots TiBeam stem, FSA carbon cranks, Easton carbon seatpost and handlebars, pb brakes and brake levers, you get the idea, also on Giant carbon HT with proshift front and rear derailleurs, proshift twist shifters (really cool billet shifters that work awesomely)

    Overall Rating:5
    Value Rating:5
    Submitted by Rod a Cross Country Rider from Macon, GA

    Date Reviewed: June 1, 2004

    Strengths:    Strong as an ox.

    Weaknesses:    Expensive (when I bought it early 1995).

    Bottom Line:   
    I bought it because I was after an alternative, and wanted durability and "rebuildability". I had a BIG crash (~30mph) and bent the mess out of the derailleur hanger, but didn't do anything to the Proshift! Nine years and counting without an overhaul...pretty good in my book.

    Expand full review >>

    Favorite Trail:   it's closed now...

    Duration Product Used:   More than 3 years

    Price Paid:    $400.00

    Purchased At:   Local Bike Store

    Similar Products Used:   XT, LX, etc.

    Bike Setup:   Klein Attitude ('95), XT front, Rock Shox

    Overall Rating:5
    Value Rating:5
    Submitted by Steven a Racer from Maine

    Date Reviewed: January 17, 2004

    Strengths:    Well designed, light weight, rebuildable, works great, made in the USA

    Weaknesses:    At the time of purchase, these were more expensive than XTR.

    Bottom Line:   
    I've had two of these deraillers in service for close to 10 yrs now ( bought'em in '95 I think, back when Precision went by Gorilla Billet). They are highly under rated, hardly require any attention, and have proved to be quite durable. I had to rebuild one of them several years ago - ripped the derailler off the hanger when a branch attacked my rear wheel during a race...had to rebuild that wheel too. Anyway, anyone with a little mechanical aptitude can rebuild one of these babies in about 30 min...it's a nice option to have instead of just tossing it when you mangle a component.

    Expand full review >>

    Duration Product Used:   More than 3 years

    Similar Products Used:   Shimano XTR,XT,LX; SRAM (900,9.0); Campy

    Bike Setup:   Which one?

    Overall Rating:4
    Value Rating:4
    Submitted by Tom Essick a Racer from Kindsbach, Germany

    Date Reviewed: August 27, 2003

    Strengths:    Lightest derailleur, colors, not the "Big S" company

    Weaknesses:    Needs more attention than Shimano derailleurs, Sram 9sp incompatibility.

    Bottom Line:   
    These derailleurs rock! However, they do need more attention during initial set up. I find they work best when using Gore cables and a Shimano floating top pulley. If you have Sram 9sp shimano compatible shifters, don't even attempt using this derailleur! They mixed like oil and water! I had to ditch the Sram shifter for a shimano XTR 9 sp unit, and perfection! Shifts are clean and crisp, with no problems what so ever. I use a Dura Ace 12-27 cog in the rear, so people with larger gears may have a problem with the mid cage design. Bottom line: It works great, but if you aren't mechanically inclined and don't work on your own bike, then I wouldn't recommend this derailleur.

    Expand full review >>

    Favorite Trail:   To many to list

    Duration Product Used:   2 Years

    Price Paid:    $75.00

    Purchased At:   Cambriabike

    Similar Products Used:   Shimano, Shimano, Shimano

    Bike Setup:   Dean Duke, Pace and Stratos shocks, XC setup

    Overall Rating:5
    Value Rating:5
    Submitted by Matt Ireland a Racer from Devon

    Date Reviewed: May 15, 2003

    Strengths:    Incredibly light-lightest I've ever used, wicked graphics/ Colors easy to fit and it won't break. Don't take my word for it go and buy one!

    Weaknesses:    A tad pricey but you really do get what you pay for with a Proshift, don't buy one if you are a X- country rider, leave em for the big dogs

    Bottom Line:   
    The Dogs B*****ks, really they are and they will make your transmission extremely responsive

    Expand full review >>

    Favorite Trail:   2and8 Trails

    Duration Product Used:   Less than 1 month

    Price Paid:    $90.00

    Purchased At:   The Bike Show

    Similar Products Used:   Shimano XT, XTR

    Bike Setup:   Orange Ms Isle

    Overall Rating:5
    Value Rating:5
    Submitted by chuck a Weekend Warrior from ny

    Date Reviewed: February 13, 2003

    Strengths:    durable, shifts on par(if not better than)shimano

    Weaknesses:    i guess lack of availale parts

    Bottom Line:   
    ive been using these for years and although i stated that parts arent readily avail anymore to fix them...i havent had to. ive used it with 8 and 9 speed drive trains and have never had a problem. they need to be set-up and adjusted like every other bike part, and once they are, they do a great job at what they are made to do. been working for me for years...

    Expand full review >>

    Duration Product Used:   More than 3 years

    Similar Products Used:   xt, xtr, sachs...


    Overall Rating:1
    Value Rating:2
    Submitted by Aaron McGraw a Weekend Warrior from Oil City, PA, USA

    Date Reviewed: January 4, 2003

    Strengths:    Well.... evidently it's not so strong

    Weaknesses:    In retrospect, it's sort of weak...

    Bottom Line:   
    Well, I was right in thinkin' it was kind of flimsy. I absolutely crushed it on a huck gone horribly wrong. And as for rebuildability? No parts are available from Precision Billet OR Cambria (like the guy on the phone said "WHAT kind of derailleur???" I have to modify my review. Don't buy this deraileur - it's little more than a novelty. Fragile, flimsy, and now, un-fixable.

    Expand full review >>

    Favorite Trail:   Venago County....somewhere

    Duration Product Used:   3 months

    Price Paid:    $75.00

    Purchased At:   Cambria

    Similar Products Used:   Acera-X, Exage Trail, Suntour a-5000, Suntour XCE 4050, Deore LX, and now...XT.

    Bike Setup:   Deore front mech, LX and Syncros 'rings on a Truvativ 5-D crank, Kore and Titec goodies.... Weinmann Rims and Formula hubs..SRAM gripshift and NOW an XT mid-cage rear mech

    Overall Rating:4
    Value Rating:4
    Submitted by Aaron McGraw a Weekend Warrior from Oil City, PA, USA

    Date Reviewed: November 26, 2002

    Strengths:    Gnarly colors, ligther than all get-out, and highly rebuildable

    Weaknesses:    Seems kinda flimsy and very finicky. Works well on 7-spd set ups.

    Bottom Line:   
    WHY didn't my derailleur have PROSHIFT etched on it???....hell, a sticker would have even been nice.
    Okay, it's a touchy piece of equipment, liberal use of threadlocker is a must. two reasons to buy this derailleur LIGHT...rebuildable...ecclectic...excentric..weird...wait, that's more than two. Very nice...not for everyone. A good derailleur for former SunTour owners seeking to bring themselves into the 90's....isn't that the decade we live in?

    Expand full review >>

    Favorite Trail:   Venango County, Sugar Creek trail

    Duration Product Used:   Less than 1 month

    Price Paid:    $75.00

    Purchased At:   Cambria (heh heh...they're pretty cool)

    Similar Products Used:   Acera-X, Altus a-50, Alivio, Deore LX, Suntour a-5000, Sutour XC4050,Shimano 105, shift-biscuit pulleys

    Bike Setup:   get a load of this... El-Cheapo Mongoose FS Frameset, Formula hubs (black), Weinmann rims (black), deore front mech (spiffy black clamp and adapter), Truvativ 5-D cranks (black), Syncros outer chainring (black), Proshift rear mech (black), LX middle ring (not black), Truvativ Stainless inner ring (not black and not light), Kalloy 30.0 mm x 350 seat post (not black), SDG saddle (black), Kore light stem (hell, you know what color it is)...Diacompe Aheadset (err..its black, too), Nashbar clipless pedals (gee, they are black, too), WTB Nanoraptor blackwalls, KKT chain (brown...ewww), SRAM MRX seven speed shifters, Nashbar 13x30 7-speed cassette, Titec bar (black...), and profile bar ends (err...they is black too...) host of black and red lizard skins goodies, and a black Mozo ML-10 fork....sparkly red Shwinn grips.

    Overall Rating:5
    Value Rating:4
    Submitted by Donat a Cross Country Rider from france

    Date Reviewed: December 31, 2001

    Strengths:    light, nice, efficient, reliable .

    Bottom Line:   
    Short cages are nice but confidential.

    Poor compatibility with standard 9Speed MTB. Standard 9 Speed gear staging is stupid in MTB, so to get the best, use 8Speed cassette or 'road 12/27'.
    Very reliable, very low maintenance, works always, no tuning never needed ... short cages are nice!

    BUY it if you accept to be precise with you gear settings (no crossing).

    Expand full review >>

    Favorite Trail:   singletrack

    Duration Product Used:   More than 3 years

    Price Paid:    $110.00

    Purchased At:   local dealer

    Similar Products Used:   XTR short cage


    Overall Rating:4
    Value Rating:4
    Submitted by ivor biggon a Downhiller from england

    Date Reviewed: December 12, 2001

    Strengths:    material irs made from

    Weaknesses:    flimsy

    Bottom Line:   
    excellent product from pro shift but a bit flimsy

    Expand full review >>

    Favorite Trail:   smelly alley

    Duration Product Used:   1 Year

    Price Paid:    $50.00

    Purchased At:   willy wonkers

    Similar Products Used:   xt rear mech

    Bike Setup:   saracen x-ile

    Overall Rating:5
    Value Rating:5
    Submitted by Chuck a Weekend Warrior from Ithaca, NY

    Date Reviewed: October 3, 2001

    Strengths:    Smooooooth, effortless shifting, super quiet, rebuildable/serviceable, beautiful machining, US-made, lighter than just about anything else out there, and did I mention smooth shifting?

    Weaknesses:    Somewhat finicky to set-up, tiny bolts MUST be threadlocked, top-floating pulley doesn't really float.

    Bottom Line:   
    I run a Proshift for a bunch of reasons:

    1) I find that the spring tension on the derailleur is stiffer than most of the big "S" derailleurs, or at least just as stiff.
    2) Smoooooth and effortless shifting. Remember though, it is a medium cage which = NO CROSS-CHAINING. In trials that isn't an issue. On my GT, still no problems and good shifting = no cross-chaining anyways.
    3) What gear am I in? did I shift? SUPER quiet. Most times I don't hear the derailleur shifting, it just happens.
    3)Totally rebuildable and serviceable. Personally I don't feel good about throwing away a whole derailleur when you can just replace the parts that you've broken. It's such a waste and is environmentally unsound. Why do you think the big companies make their products one-time use only? So you HAVE to buy a whole new part instead of just buying individual replacement parts-it's a strategy that puts profits over practicality.
    3) Made in the USA. No, I am not a Republican (nor a Democrat for that matter), nor a redneck, nor a really patriotic person - I just think too much money and too many jobs are lost to foreign trade/third world contracting. Support the little guy!
    4) Lightweight, but not to the point of compromising its durability.
    5) Cost-effective. $100 on their site, $75 at Cambria - same range as XTR with the added characteristics above.
    6) Pretty to look at-as far as aluminum objects go.

    I can go on and on, but you guys get the picture. Buy this and you will have a derailleur for life. It's a little finicky to fine-tune, but when you do it is nothing short of beautiful. A full 9-spd setup didn't work well for me (especially the cassette)-lots of jumping, but IMHO 9-spd just plain *sucks*- I'll stick with 8 until internal gears are perfected and lighter. Be sure to threadlok the tiny screws and such or they'll come loose, it's important that you follow the instructions that come with it.
    That's all.

    Expand full review >>

    Favorite Trail:   Anywhere bikes are allowed and college campuses!

    Duration Product Used:   6 months

    Price Paid:    $75.00

    Purchased At:   cambriabike.com

    Similar Products Used:   XTR, XT, LX blah, blah, "S" this and RAM that...not that shimanoram makes bad products-but when you have great-performing alternatives...

    Bike Setup:   GT Avalanche frame, Proshift (duh), King hdst, Avid mech.disc ft, Avid Ultimate rr, Marzocchi Atom, XTR crank/cass, Easton bar, Thomson post, etc., etc....
    Echo ES1 (trials-specific), Planet-X Knifen (sooon!), Proshift (yup, another one), King hubs/headset, Rhynolites, Tioga DH, Avid mech ft, HS-33 rr/Plazmatics, Easton carbon bar/post, SLR seat, lock-ons, Thomson stem, blah, etc....

    Overall Rating:5
    Value Rating:4
    Submitted by Sean a Downhiller from Santa Cruz California

    Date Reviewed: September 16, 2001

    Bottom Line:   
    Clean shifiting, Cool colors VERY easy to service but you dont need to

    Expand full review >>

    Favorite Trail:   Magic Carpet

    Duration Product Used:   1 Year

    Price Paid:    $100.00

    Purchased At:   www.Bombshellparts.com


    Overall Rating:5
    Value Rating:5
    Submitted by Ken a Cross Country Rider from Salt Lake City, Utah

    Date Reviewed: August 10, 2001

    Strengths:    Still has great shifting, has not fallen apart, still the lightest available. Machined look is still better than Shimano or SRAM. Cheaper than XTR, too, from the right places.

    Weaknesses:    Still no anodized ultra dark purple or tan? More seriously, I still think PB should look at mildly revising this derailleur to be more mass-market friendly, and perhaps adding other components to their lineup. I'm personally biased toward being able to one day get PB shifters.

    Bottom Line:   
    I look at my setup and I wonder why the only things that have been damaged are the two Shimano items. I try not to hate them; some of their products have done fine on my other bikes. Though sometimes I ride extremely fast, I try to keep my form smart- I pick good lines, land my drops smooth, and keep a smooth pedal stroke so as not to uselessly abuse my ($$$) equipment. Nevertheless, my XT cassette and XTR shifters have been the first, and thus far only, equipment to suffer any real damage (half-season each). Odd since they're relatively removed from where most trail abuse is received. The plastic casing of the XTR shifter is not as burly as it looks--cracked quite easily on an unweighted endo, and even then the handlebar took the brunt of the impact. Probably a miscellaneous pedal somewhere. Luckily it's still rideable. I'm looking at replacing the XT cassette with SRAM 9.0, but dammit I sure wish Precision had shifters. Can you imagine XTR-quality shifting encased in an aluminum billet shell? Perhaps I should have stuck this in an XTR shifter review. XTR shifters are still the best right now, but Precision has the best derailleurs and rim brakesets.

    Expand full review >>

    Favorite Trail:   Desolation Lake

    Duration Product Used:   1 Year

    Similar Products Used:   Shimano

    Bike Setup:   RM Instinct w/Z2-Atom, Thompson post and stem, Chris King hubs and headset, Precision Billet brakeset and derailleurs, Raceface Next splined cranks, XTR shifters, XT cassette, Frog pedals, Fly seat, Salsa skewers, SRAM chain.

    Reviews 1 - 15 (53 Reviews Total) | Next 15

    Review Options:  Sorted by Latest Review | Sort by Best Rating


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