My square tapered bottom bracket (stbb) is 68/122.5. I have an old 1999 Specialized Hardrock that uses a VERY primitive looking stbb (like ball bearings, and couple of rings) that looks nothing like on the picture. Would it still work? Thank you for...
62011
if you have the old style or AMERICAN style, that is NOT threaded inside the frame, punch out the races and use the TRUVATIV BB conversion! YOU WILL BE VERY HAPPY YOU DID! There are a TON of videos on how to do this, check out bikeman (I think that is his youtube handle) and you wont be let down! JUST MAKE SURE YOU INSTALL THE DRIVE SIDE PROPERLY AND LINE UP THE CONVERSION BEFORE YOU SEAT IT INTO THE FRAME! The screws to the conversion will pull it TIGHT but make sure it is in far enough to not strip the screws or adapter! THIS BB is one of the best values in the industry! I dont recommend any UNDER this model, even though they are VERY RELIABLE. THIS is a small price to pay and while you are there, I recommend an upgrade to your crank set to bring you an upgrade that will breath life into that nice HARDROCK! IF YOUR FRAME IS ALREADY THREADED, no worries, this should work!
1182292
The diameter won't likely be your problem. The length was the issue for me. It was a little too long, and wouldn't lock. However, I was able to grind part of the bolt off and get it to work. You might want to measure the space between your forks to get a better idea it it will work for your bike.
1204758
Sure. Several things to check first: your bottom bracket must be a 'square taper' axle to fit the square taper holes in the crank. You will need to adjust the front derailleur upwards to clear the big chain ring, make sure your frame will allow that. Also, you may have to add links to the chain. Some frames will have water bottle braze-ons in the way, some suspension frames may have tubes in the way. If your bike has a triple crankset now, you can adjust your shifter to accommodate the double chainrings. Beyond those simple things to check, this crank should bolt on and work fine with your 7-spd cassette. Sure. Several things to check first: your bottom bracket must be a 'square taper' axle to fit the square taper holes in the crank. You will need to adjust the front derailleur upwards to clear the big chain ring, make sure your frame will allow that. Also, you may have to add links to the chain. Some frames will have water bottle braze-ons in the way, some suspension frames may have tubes in the way. If your bike has a triple crankset now, you can adjust your shifter to accommodate the double chainrings. Beyond those simple things to check, this crank should bolt on and work fine with your... » Read More Sure. Several things to check first: your bottom bracket must be a 'square taper' axle to fit the square taper holes in the crank. You will need to adjust the front derailleur upwards to clear the big chain ring, make sure your frame will allow that. Also, you may have to add links to the chain. Some frames will have water bottle braze-ons in the way, some suspension frames may have tubes in the way. If your bike has a triple crankset now, you can adjust your shifter to accommodate the double chainrings. Beyond those simple things to check, this crank should bolt on and work fine with your 7-spd cassette. « Show Less
2209376
I running a 180 mm front and rear on my trail bike and my riding buddy's are running 203mm. Just need to get the right "shimano" adaptor for the rotor you are planing to run.
1417602
Yes. It takes the modern square tapered spindle. I used a Sunlite tapered spindle bottom bracket unit for mine.
2278239
I thought it was a weird question until I looked up "Bb68 73" and found this...Shimano XT SM-BB70 Hollowtech II Bottom BracketLooking at the pictures on the left...Now that's weird.
42173
Measure your bottom bracket to be sure, but this is the most common size I've run into while replacing bottom brackets on bikes I fix. Provided your crank is a square taper and not an octalink or something like that.
373347
Hi Carlos; all the answers are good but I particularlly like Skips answer. I might add, Shimano UN55 is a square taper bottom bracket and the crankset has to be square taper also. Good luck.
1304339
I also have a Specialized Hardrock 29er. I just hooked it up and it fits at the bare limit. It very slightly rubs the tire at the mount so I would not use it for a 29er.
509301
there should be a label on the bottombraccet itself with all the specs on it. if you cant find the info on the specialized web site the simplest is to remove the bottom bracket and take the info from there.
859508
Check Shimano's documentation for maximum tooth difference for the 2300 RD. Chances are it'll work, or at worse, only support the 28t in the small chain ring. The cheapest option, of course, is to pedal harder.
312389
No it doesn't. Fairly standard square tapered required. Or maybe the BB you have will do. 1-2-3 is correct though. Get a new derailleur for the size difference. Had to change mine.
716774
Sorry, I can't find a record of my Bottom Bracket order but would recommend checking out this page for advice.http://sheldonbrown.com/bbsize.html
860518
I have a 107x68mm on a long haul trucker. I think I had a 110 or 113 with the same crank on a previous cross bike. So, the answer, I guess, is maybe.
357782
If the bottom bracket has screw in ends it should be fine? Mine fit fine, I'm got a 2012 Rocky Mountain...mtb. Make sure the chain rings are the size you want though before you purchase, I changed all of the ones that came on mine.
937154
Hey Gordon, I bought this as a replacement crankset for my Trek FX and haven't gotten around to taking the bike apart yet. All I can tell you is that it is for a square taper BB. Check this website. http://www.rivbike.com/product-p/cr1.htm
15227
My first suggestion is to read all the previous answers on the UN55 before you attempt to replace your bottombracket assembly. If you can remove the spindle, look to see if the specifications of the spindle are embossed on the spindle itself. For example, my Shimano spindle has specifications of 68 - 122.5 embossed on it, the smaller number is the bottom bracket bearing tube width and the larger number is the actual spindle length. Then select the UN55 sealed bearing BB that is the closest to your measurements.