Bicycle Mechanics - Squeaky something after chain falling off...

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ac220v
05-02-08, 11:02 AM
On today's ride my chain half-derailed from the sprocket, freezing it into place (quite scary on a 25+kmh downhill,,,) I of course had the tools, and fixed it but after that the whole thing started buzz-buzz-buzzing when I start or go uphill and squeak-squeak-squeak-SQUAWK-SQUAWking when I start to ride faster, at speeds above 22 km/h squeaks nearly disappear. Chain tension seems to be OK (I can move the chain 1.5 or so centimeters up and down)... What could it be?

Single-speed, coaster hub, 230-something km total on the cyclocomp, rode 15 km more with that squeak.

Torchy McFlux
05-02-08, 09:40 PM
Derailed single-speed? Check the chain for bent/twisted links. You can bend them back with a couple of pliers, or just replace the chain.
Might also want to check your chainline to make sure it's straight, and chain tension to make sure it's snug.
ac220v
05-04-08, 03:10 AM
Thanks, I'll check that.

ac220v
05-04-08, 01:43 PM
Found the squeaky part. Not drivetrain-related at all. It was bent kickstand, rubbing just the edge of tire's tread, no (major) tire damage. Don't know how I managed to bend it like that.