Join Date: Apr 2009
Location: 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
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.
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.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance