Any ideas, the chain kept coming off my langster, so I gave it a good service. New BB, chain, sprocket etc and I still have the same problem, when riding over anything bumpy the chain hopes off at the back, it feels almost as though the chain is seizing and hoping off.
I had been running the bike with the wrong size BB which I thought was the problem. The new BB is the correct size for the frame/crank so the chain line is now as it was when it came out the factory and it all looks to line up.
Chain is tight but not too tight.
Anything else I should look at?