The Cheuh Posted September 4, 2010 Share Is there any remedy for a stripped thread inside a mtb frame where the BB has to screw in? Link to comment Share on other sites More sharing options...
Wannabe Posted September 4, 2010 Share Yes, take it to a decent Bicycle Workshop, they should have the correct tool to sort it out if its not too bad. Called a "refacing tool", I think. Link to comment Share on other sites More sharing options...
eggsovereasywithteandtoast Posted September 5, 2010 Share also known as a "BB threading tool" for some reason Link to comment Share on other sites More sharing options...
Capricorn Posted September 5, 2010 Share it's only the latter. The facing tool is to literally machine the face of the BB to ensure it's properly flat. it has nothing to do with threading. Link to comment Share on other sites More sharing options...
onetrackmind Posted September 5, 2010 Share The stripped thread was deleted by admin. Apparently not enough pics of bikes. Link to comment Share on other sites More sharing options...
HeartCoppi Posted September 5, 2010 Share The stripped thread was deleted by admin. Apparently not enough pics of bikes. lol :lol: true to your user name Link to comment Share on other sites More sharing options...
Johan Bornman Posted September 5, 2010 Share Is there any remedy for a stripped thread inside a mtb frame where the BB has to screw in? Prepare yourself for the worse. If it is properly stripped rather than just cross-threaded, the frame is probably toast. The procedure would be do weld some aluminium inside the BB where the thread used to be. Then to machine it out to what an unthreaded BB would be and then to thread it. The cost involved and the skill required is probably too much. Give it one attempt by chasing the right tap through there. If that doesn't work, decide what colour your next frame will be. Link to comment Share on other sites More sharing options...
eggsovereasywithteandtoast Posted September 5, 2010 Share A question that I have is: how did this happen? Is it fairly common? Link to comment Share on other sites More sharing options...
droo Posted September 7, 2010 Share A question that I have is: how did this happen? Is it fairly common?Usually caused by cross-threading and forcing. I wouldn't say it's common, but it happens. On a road bike you can remachine and retap an English thread to an Italian thread, (JB can correct me here?) but on an MTB you're pretty much toast. Unless you epoxy an external BB cup in there, which *might* work. If you get it straight. Link to comment Share on other sites More sharing options...
The Cheuh Posted September 8, 2010 Share It was simple really. Someone screwed up when they installed the initial BB or they used a crappy frame which already had a stripped thread. I removed the original BB in a frame and there it was. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now