Originally Posted by
frugihoyi
Now I have a new issue: I asked the dude for the size of the bottom bracket so I could get a new one and he told me 122. I'm finding it hard to believe that's correct and unfortunately I didn't bring the old one home with me. See, the part of the frame where the bottom bracket goes into is 70mm wide, so 122 seems way too wide, even considering the part that sticks out. Is there a way to figure out the size of the bottom bracket based on those 70mm?
122mm is the axle length to put your crank arms and chainrings at the proper distance from the frame. Look for a bottom bracket designed for a 70mm wide shell and matching thread spec (likely Italian, but not 100% definite) with a 122mm long axle. What make/model is your bike and your crank? How many chainrings?