View Full Version : What's that noise?

09-14-2011, 09:32 PM
I'm getting a buzzing noise from down below that's driving me nuts, no pun intended. I think I've eliminated the chain because this noise doesn't occur when I'm coasting.

It occurs regularly, but REALLY kicks in when I swerve back and forth. Doesn't sound good at all. Any suggestions?



Allen Muchnick
09-15-2011, 01:24 AM
I'm not sure what you mean by a "buzzing" noise, but noises can be generated from many drive train components. I'd start by inspecting the bottom bracket/cranks, the pedals, and the rear derailleur pulleys, then check the tightness of the chainring bolts and the rear cogs.


Allen Muchnick

09-15-2011, 08:07 AM
U sure you dont have a tire rubbing against the frame - or a brake pad rubbing against a rim. Where does the sound come from.

09-15-2011, 10:30 AM
If you don't hear it when coasting, it could be that one or both of your derailers are out of adjustment and there's some friction from either the cage in front or somewhere in the system in back. I'd start by making sure all your shifters and derailers are adjusted correctly.

Allen Muchnick
09-23-2011, 04:55 PM
Among other things, check the B-limit screw setting on the back of the rear derailleur. The buzzing might be due to grinding of the jockey pulley on the rear derailleur.