PACIFIC CYCLE Part - Derailleur Drivetrain Shifting; Derailleur System and Shifting Basics

96
Problem
Freewheel does not rotate
Brakes not working effectively
When applying the brakes
they squeal/squeak
Knocking or shuddering when
applying brakes
Wobbling wheel
Possible Cause
- Freewheel internal pawl pins are
jammed
- Brake blocks worn down
- Brake blocks/rim greasy, wet or dirty
- Brake cables are
binding/stretched/damaged
- Brake levers are binding
- Brakes out of adjustment
- Brake blocks worn down
- Brake block toe-in incorrect
- Brake blocks/rim dirty or wet
- Brake arms loose
- Bulge in the rim or rim out of true
- Brake mounting bolts loose
- Brakes out of adjustment
- Fork loose in head tube
- Axle broken
- Wheel out of true
- Hub comes loose
- Headset binding
- Hub bearings collapsed
- QR mechanism loose
Remedy
- Lubricate. If problem persists,
replace freewheel
- Replace brake blocks
- Clean blocks and rim
- Clean/adjust/replace cables
- Adjust brake levers
- Center brakes
- Replace blocks
- Correct block toe-in
- Clean blocks and rim
- Tighten mounting bolts
- True wheel or take to a bike shop
for repair
- Tighten bolts
- Center brakes and/or adjust brake
block toe-in
- Tighten headset
- Replace axle
- True wheel
- Adjust hub bearings
- Adjust headset
- Replace bearings
- Adjust QR mechanism