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XTR bottom bracket for Ultegra crankes(5 posts)

XTR bottom bracket for Ultegra crankesJHooper
Mar 19, 2002 5:41 PM
Hi, I have been reading the threads on this board everyday for almost two years and this is my first time posting. I have learned so much about roadbikes even though I have never owned one, unless you count my Steve Bauer edition supercycle when I was 16.

Anyways I am building my first bike and I need to know if I can use a XTR bottom bracket with Ultegra cranks.

Thanks, John.
re: XTR bottom bracket for Ultegra crankesmosovich
Mar 19, 2002 6:31 PM
Yes, you can use them. I have to use them on my cross bike.
re: XTR bottom bracket for Ultegra crankesJHooper
Mar 19, 2002 6:56 PM
Thanks, the wrench at the bike shop said it would work but I thought I would ask you guys here as it is the wrench who is selling it. He seems like a pretty smart guy.
It's hard to think that tommorow is Spring, it has been -15c to -25c all this month in Calgary, but I am still getting excited about having a new to me roadbike in a few weeks.

I was told that you can't...ohio
Mar 20, 2002 10:01 AM
... XT/LX uses the same BB as the road stuff, but I thought that XTR used a slightly different one, because the XT crank is lighter than the XTR and they wanted to keep the XTR "system" lighter than the XT "system", so you're forced to use the heavier BB, unless you want to use Dura-Ace on your MTB.

You can always call Shimano and ask.
Nope. You can.laffeaux
Mar 20, 2002 10:52 AM
The XTR bb uses the same spline as DA and Ultegra. The only difference is that the XTR is adjustable (via spacers) to be used on a 68mm or 73mm BB, while the road BBs are not.

The XT and LX splines are different. Not sure where 105 fits in.