Originally Posted by
Retro Grouch
You might be right BUT, everything on a bike works together. You can almost never replace just one part.
I'm assuming you asked for advice because you felt that you lacked experience. You now have several more experienced bike guys who have suggested a new crank may well require a BB with a different spindle length. I, for one, think you would be wise to heed that advice. Since you're ordering a new BB anyway, make sure that it has the correct spindle length to match your new crankset. That's all that everybody is saying.
Yes, of course the bottom bracket will have to be replaced
if it isn't the proper length. But we know nothing about the crank Scooty Puff wants to use nor anything about how long the current spindle is. I suggest he try using the one he currently has that is working properly and cross the bridge of a new spindle if he comes to it.