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Italian Thread BB question(6 posts)

Italian Thread BB questionxxbigfootx
Aug 23, 2001 7:34 AM
Put in my order for a Colonago Masterlight cross bike and it has an Italian thread BB. I need a BB that will fit XTR cranks in a 112 length, with an Italian thread. Does anyone know where I can find one? Also, Does anyone know if Shimano ever made braze on XTR or XT front der. Thanks for the help

Might helpAtombomber
Aug 23, 2001 11:12 AM
No, Shimano never offered braze-on XT or XTR front deraileurs. For something similar, you should look at the FD-952-E (XTR) or FD-750-E (XT). Both the models have a bracket that is clamped by the Bottom Bracket and requires the E specific BB. I could not confirm that the XTR BB is available in Italian thread, and I tried the Shimano Euro site which offers exploded views and individual part numbers. Nothing listing XTR Italian, only English thread. I believe (though not 100%) that the BB spindle splines are the same for XTR, Dura Ace, and Ultegra. I know that the two road models are the same. If the XTR is the same I cannot confirm, though they seem alike. The LX and XT versions do not fit with XTR. For your application, you may get away with a Dura Ace or Ultegra BB, though the XTR is 112.5mm or 116mm, and the Ultegra is 109.5mm (double) or 118.5mm (triple)or DA is 109.5mm.

I hope others can confirm or deny the XTR/Ultegra-Dura Ace crank to bb interface. Good luck. If I have time, I'll pull the XTR and Ultegra cranks off my bikes such equiped and see how they work on the other one. Good luck in your hunt.
Did the test.Atombomber
Aug 23, 2001 7:31 PM
Switched over the XTR cranks to the Ultegra BB and vice versa, and they fit. The 3mm difference (1.5mm/side) is not too much, if you have enough clearance between the end of the crankarm and the chain stays. You can offset your cleats by that distance to compensate.

If you need a braze-on front deraileur, go with the Ultegra triple. It should allow you the greater range, which you will need for your XTR crank. If you are only using the middle and the outer ring, and a double shifter, you will still need the triple front d. Any compatible mountainbike band type front D will work if that is what you need.
Thank You very muchxxbigfootx
Aug 24, 2001 9:06 PM
Thank You, I appreciate your advice and your time for helping me. Thanks once again.

re: Italian Thread BB questionRusty Coggs
Aug 23, 2001 6:00 PM
Shimano road splined BB work with xtr cranks,but the choices are 109.5mm or 118.5mm in both english and italian threading. I have found no listing for an xtr in 112 with italian threading. xt/lx splines are not compatible with the others.
One thing.Atombomber
Aug 23, 2001 7:23 PM
105 is the same spline as LX/XT