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01-20-14 | 05:20 PM

#2

FBinNY

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Joined: Apr 2009

Posts: 39,897

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From: New Rochelle, NY

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Quote:

Originally Posted by mjhickok

So I took the bb off my 2012 Trek Wahoo. The label on the bb says 73x 122.5. I need to get a new power spline bb for it. Will I need to get a different size for the power spline?

I assume (only an assumption, so best to measure) that the BB shell width is 73mm (mtn bike"), and the 122.5 might refer to the spindle length.

If I'm right, the 73mm stays the same (part of the frame) and you have to get a BB made for that. But the spindle length may change according to the crankset's offset. Usually crank specs mention recommended spindle length someplace.

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