I brought my bike into the shop this afternoon for a tune-up, and when I got it back it was making this rattling noise (begins 2 seconds in)
from somewhere in the vicinity of the rear wheel.
The shop claimed that it's the chain scraping alongside the cage of the front derailleur, and that I could eliminate the noise by adjusting the derailleur with the gear shifter at my left hand.
I was happy with that (I know nothing about bikes), but a) playing with the gear shifter doesn't seem to eliminate the noise and b) the noise happens even when I'm coasting and the chain's not moving. I'm worried something else is wrong.
Some other information:
* the noise sometimes starts as soon as I get on the bike, sometimes not.
* hitting a bump in the road often makes the noise
Any advice would be great. I'm happy to provide more information if that would be helpful.