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Will MTB crank work on Road BB?(6 posts)

Will MTB crank work on Road BB?bigdave
Oct 9, 2002 10:39 AM
Specifically, the Shimano FC-M440 MTB crank, on a Ultegra BB (68-109.5)?

I am basically looking to put a splined BB-crank combo on my fixed-gear. I want it to be strong and reliable, which that stuff is, as well as keep my chainline decent. I previously had a 107mm square-taper on it and the chainline was right on... and I don't think the 1.25 mm extra on the right side will hurt it much if at all.

The crank mentioned above has a 44T outer ring, which is perfect for my setup. And the Ultegra BB is good because it's sealed... and this bike is abused, so BB maintenence is not something I want to do (one reason the old sq. taper went out the door)

I'm open to other ideas with a splined BB/crank combo, like ISIS... but keep in mind I am cheap. :-)


no it wont workstr8dum1
Oct 10, 2002 6:40 AM
only xtr arms fit on ult or DA BB's
xt or lower use another model of mtn bike bb's
I suspected that...bigdave
Oct 10, 2002 8:08 AM
Well, I might just try to find a used Ultegra/105 crank out there... that should still fit my bill. I was just trying to do it on the cheap for new stuff.

Thanks for the tip.

Use a 113mm ES-70 BB (splined)JS
Oct 10, 2002 8:49 PM
They're cheap ($25.00) and bulletproof.
RE: Use a 113mm ES-70 BB (splined)... ??bigdave
Oct 11, 2002 8:52 AM
JS... what I'm worried about is that the ES-70 will bung up my chainline with the longer spindle. The one coming off my double was a 107...

Any thoughts on that?

Not only spindle length determines the chain lineMarkus_B
Oct 12, 2002 11:58 AM
The splined crank arms seem to require a longer spindle. Chainline is not only dependent on the lenth of the spindle, but also on the crankarms' setoff.

a few years ago, I replaced a 107 mm taper BB with 1995 LX cranks by a 112,5 mm splined BB with XTR cranks and I didn't notice a change in the chainline (though I didn't measure it).