XTR crankset/Dura Ace BB?

Hey, I have a 9sp XTR crankset and a pair of Dura Ace BBs. Where do I look to see if I can run the
cranks on my existing BBs?

It seems to me that the XTR BB is backwards compatible to road triples, so it'd figure that the D/A
would be compatible with the XTR mtn cranks.

Can I? If I can't, what's the difference between the two?

 

Mike-<< Hey, I have a 9sp XTR crankset and a pair of Dura Ace BBs. Where do I look to see if I can
run the cranks on my existing BBs?

Splines are the same but overall length and left/right overhang for the two BBs(XTR/DA) are
different. 'May' work, but may not-

<< It seems to me that the XTR BB is backwards compatible to road triples, so it'd figure that the
D/A would be compatible with the XTR mtn cranks.

XTR BB is generally too short for road triples...

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene"

 

> Hey, I have a 9sp XTR crankset and a pair of Dura Ace BBs. Where do I look to see if I can run the
> cranks on my existing BBs?

The good news is that the splines are identical, so you can fit XTR cranks to a D-A BB. I do the
opposite - run D-A cranks on an XTR BB with no problems.

The bad news is that the lateral offsets on XTR and D-A BBs differ; this means you will probably get
cranks that are asymmetrically placed left-to-right and a lousy chain-line (that difference works in
my favour with my setup, but you would be doing the opposite).

Anyhow, why not just try it and see how it looks?

 

"Peter Headland" <[email protected]> wrote in message
news:[email protected]...
> > Hey, I have a 9sp XTR crankset and a pair of Dura Ace BBs. Where do I
look
> > to see if I can run the cranks on my existing BBs?
>
> The good news is that the splines are identical, so you can fit XTR cranks to a D-A BB. I do the
> opposite - run D-A cranks on an XTR BB with no problems.
>
> The bad news is that the lateral offsets on XTR and D-A BBs differ; this means you will probably
> get cranks that are asymmetrically placed left-to-right and a lousy chain-line (that difference
> works in my favour with my setup, but you would be doing the opposite).
>
> Anyhow, why not just try it and see how it looks?

I heard that the XT level BBs didn't fit, then I heard from here that there's a guy running XTR on
his road cranks, so I figured I'd ask before I bunged things up. Since the splines are the same, I
figure that the difference of just a few mm (112.5mm v. 109.5mm) isn't going to really screw up the
chainline...

I haven't had a chance to go put things together. Once I do, I'll post results.

Mike