BB Compatibility
09-15-11, 11:56 AM
#1
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BB Compatibility
I was looking at the Shimano UN-54 BB on Amazon, and noticed they didn't have a 68x122.5mm option. There is, however, a 68x122mm option, and I was wondering if that was close enough to or is compatible with a 68x122.5mm BB like the one Specialized says my bike has? Of course, 68x122.5 is available in the cheaper Un-26 BB on there. 
09-15-11, 12:13 PM
#2
Senior Member
The .5mm difference is 2/100 of an inch. Assuming the BB is symetrical (important to find out before ordering), that moves your crankset 1/100 of an inch closer to the frame. That will work fine.
09-15-11, 02:04 PM
#4
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It could even be that the one listed as 122mm is actually 122.5mm. Certainly nothing to worry about.
