i have a campy drivetrain on one of my bikes. recently i’ve been noticing an intermittent vibration, which i can only really feel through the pedals. there’s no predicting when it will happen - no apparent dependance on big/small ring, speed, power output. i have yet to experience it while coasting, but living in the flatlands means not much coasting on this bike. also, i swapped pedals and still felt it. the vibration is pretty low-amplitude, reasonably high frequency. it almost feels like i’m riding knobby tires.
any ideas?