okay, so here's what's going on: something in the drivetrain in "slipping" for lack of a better term. if i put all my weight forward, say to accelerate quickly, the crank slips forward maybe a 1/5th or so of a full rotation before it "catches" again. the same thing happens if i have to brake hard and pull back.

i tightened the cog and lockring, so i don't those're the problem. i could check again though. i've tightened down everything else i can think of. just hoping it's not a bb problem?


suggestions?