Originally Posted by
crispyblunts
i've had a similar problem. i went on a ride to the beach and heard squeeling noises coming from my bottom bracket. then the crank just slipped forward when i applied pressure hard from a stop. it slipped almost a half turn. i dont know what the problem is exactly, but my lockring and cog should be properly tightened. i havent done anything to the cog since i originally got it, but i do check my lockring to make sure its tight from time to time. everything seems to be properly tightened so what might the problem be?
i looked at the markings on the bottom bracket and they dont change position at all, so i'm left to think it must be something with the spindle? the cranks are not stripped btw, they are also in good shape. any ideas?
Come on, lets use our brains here. If your cranks were slipping that much, your crank arms would no longer be opposite from each each other, which would probably be noticeable, and the spindle would have have be rounded out on one of your cranks, which would be pretty easy to see visually if you took the bolt out. Another way your crank arms could be slipping would be if the spindle broke in half, but then there would be no resistance on the left crank arm, which would also be noticeable. Both of these scenarios are very unlikely (I'm sure its happened at least once though), and if that really was your problem, I think you would be able to recognize it. Take your bike to the shop and have them properly tighten your cog and lockring before your strip your hub. If you really think about it that is the ONLY place a fixed gear drivetrain could be slipping.