[chrdur]

I want to replace the crank on my Trek XO 1 with a Dura Ace crank, but can't find which bottom bracket spec is used on this frame. I am guessing bb86, but don't want to order anything before I can confirm that. I'll try Trek tomorrow, but thought I would check if anyone here knows today.

Thanks

 

[VCRC Bike]

It's not BB86. No Trek uses BB86. It is either BB90 if the bearings are pressed directly into the frame or a standard English threaded BB if the frame requires a BB. Here is a good read for all the different BB types now being used: http://vcrcbike.blogspot.com/2010/03/different-bb-types.html

 

[chrdur]

Thanks, they are press in bearings. Good to know. I almost ordered a bb86 kit.

 

[VCRC Bike]

You know, you may want to check with Trek. I was just checking out their site and someone mentioned the XO uses BB83, so double check. Their road stuff uses BB90 and I assumed the cross stuff did as well, since they invented the BB90.