Bottom Bracket question:

Are you asking in an XTR crankset will fit on your 29er?

digitalayon said:

I ahve a Hollowtech XT crankset that I'd like to have on my 29er project. However I would like the lightest one possible. Would a XTR fit it? What are my options? Google sucks for this kind of thing.

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There's a difference between Hollowtech I and Hollowtech II (octalink vs external bb). They'll fit your freak bike just fine. If you want to be a weight weenie and look up the weights go to weightweenies.starbike.com and look at the listings... If you want the lightest crankset possible there are other alternatives....

There is also a difference between XTR and XT in Hollowtech I bottom brackets. XTR used the Octalink V1 pattern splines (same as Shimano road cranksets). XT used the Octalink V2 pattern splines.

So they can't use the same bottom bracket

Model is FC-M752......It's a Hallowtech 1 crankset and only has about 40 miles on it(puilled from a bike my wife no longer rides)

That is a good crankset, but it does use a Octalink V2 bottom bracket. So a set of Hollowtech I XTR cranks will require a Octalink V1.

mtnbiker72 said:

There is also a difference between XTR and XT in Hollowtech I bottom brackets. XTR used the Octalink V1 pattern splines (same as Shimano road cranksets). XT used the Octalink V2 pattern splines.

So they can't use the same bottom bracket

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Forgot that was the title of the thread!

so what are my options? And where would I get one? Is there a third party? Titanium?

Shimano still sells them, but the nicer ones (ES-71 for XT) are no longer produced. But a quick check of E-bay showed many available.

Shimano was the only ones who made them. They were not wanting to share the design without some kickbacks which is the main reason ISIS was developed. So there are no Titainium models available.

Yeah I found this on ebay and decided to buy it

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=260333456118