Originally Posted by
PatrickGSR94
That's the thing, I don't think I have a spare BB laying around to even try. I replaced both the crankset and the BB on my wife's bike at the same time (saved about 1.5 pounds in the process) but I think I may have thrown out the BB. I'll have to look around the garage and see. The only other one I MIGHT have is a 103mm one from my road bike which I know is far too short.
Ah ok. In that case you'll have to be a bit more crafty. Yes, you could try the 103 as mentioned above. You could also measure how far the drive side crank sits in on the spindle, then with the BB on the bike, estimate how big you need by holding the crank in position and measuring the difference in how far it is on the spindle. Or, if you CAN mount the crank on the BB without hitting the bb itself, mount the BB in the bike but don't screw it all of the way in. There are usually a good cm or so of threads on a BB, so play with how far it's screwed in to find the right position. Obviously measure and buy the one you then need, etc.
Alternatively, go to your local bike coop and go try some of their BBs for cheap, or go to your LBS and ask if they have any crap BBs that they're throwing away and you could have.