Do the threads look damaged ? If the non drive side is ok it sounds like they might be. chasing won't help if there isn't enough material to thread the BB into
If so I've been using one of these threadless BB's there are loads on ebay too, but I can't provide a link from my work laptop i'm afraid. You need two BB tools to fit them but mine have been good for about 2000 miles before they fall apart.
Thanks for the link. The threads look fine, just too shallow. The frame had never been built up so have to assume they were just crap from the factory.
Do the threads look damaged ? If the non drive side is ok it sounds like they might be. chasing won't help if there isn't enough material to thread the BB into
If so I've been using one of these threadless BB's there are loads on ebay too, but I can't provide a link from my work laptop i'm afraid. You need two BB tools to fit them but mine have been good for about 2000 miles before they fall apart.
http://www.sjscycles.co.uk/prestine-threadless-68mm-sealed-bearing-bottom-bracket-for-frames-with-damaged-threads-prod16505/