Join Date: Nov 2004
Location: Appleton WI
Bikes: Several, mostly not name brands.
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Is it the shell that is cracked, or the seat tube?
I've seen this happen with bulge-formed BB shells. You can repair it, but it is a big job. First you need to cut the shell into several sections, then sweat each section off the tubes, clean them all up, and braze in a new shell. If the new shell is different from the old one, you may also need to replace the chainstay bridge. And of course you'll need to repaint.