Originally Posted by
wrk101
I just use a spacer (placed under the fixed cup), and then use the same length spindle on the new bb. Your LBS should have a variety of spacers, I keep a stash of them on hand myself. I almost exclusively work on vintage bikes, and asymmetric bb were the norm.
Perhaps I should have clarified that I am converting the 7402's from double to single for a singlespeed drivetrain (and I don't have the original BB from these cranks). So, I'm not trying to duplicate the original spacing. Since I have the data from the Sheldon page, if it was symmetric, I could just do the math and reduce accordingly, without using spacers, and just pick a new BB. But with the extra 3mm, I'm not sure whether to do my subtraction from an assumption of 112mm or 115mm.
Does that make sense?