Originally Posted by
neilfein
First ride since I got the bike back from the shop, and the drivetrain makes a horrendous rubbing noise. There's nothing caught that I could see, and it was shifting pretty badly. I hope it's something as simple as they forgot to lube the drivetrain, but I didn't ask them to clean it. Weird.
Dunno what the problem was, but it's gone. As I was wheeling the bike away from the carpool after work, a bungee cord got wrapped around the cassette and under the deraileur. (I stupidly tossed it on the rack when I parked this morning, rather than put it in my bag.)
Two minutes and two rubber gloves later, I was able to extract it. I must have knocked something loose - maybe a pebble caught in the gears - because it was fine after that. Next time I have drivetrain problems, I'm gonna toss a bungee cord into the deraileur.