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TROUBLESHOOTING
TROUBLESHOOTING
Problem
Gear shifts not working
properly
Slipping chain
Chain jumping off
freewheel sprocket or
chain ring
Constant clicking
noises
when pedalling
Grinding noise when
pedalling
Freewheel does not
rotate
Brakes not working
effectively
When applying the
brakes
they squeal/squeak
Knocking or shuddering
when
Applying brakes
Possible Cause
• Derailleur cables sticking/stretched/
damaged
• Front or rear derailleur not adjusted
properly
• Indexed shifting not adjusted properly
• Excessively worn/chipped chain ring or
freewheel sprocket teeth
• Chain worn. stretched
• Stiff link in chain
• Non-compatible chain/chain ring/
freewheel
• Chain ring out of true
• Chain ring loose
• Chain ring teeth bent or broken
• Rear or front derailleur side-to-side
• Travel out of adjustment
• Stiff chain link
• Loose pedal axle/bearings
• Loose bottom bracket axle/bearings
• Bent bottom bracket or pedal axle
• Loose crank set
• Pedal bearings too tight
• Bottom bracket bearings too tight
• Chain fouling derailleurs
• Derailleur jockey wheels dirt/binding
• Freewheel internal pawl pins are
jammed
• Brake blocks worn down
• Brake blocks/rim greasy, wet or dirty
• Brake cables are binding/stretched/
damaged
• Brakes 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
• Lubricate/tighten/replace cables
• Adjust derailleurs
• Adjust indexing
• Replace chain ring, sprockets and chain
• Replace chain
• Lubricate or replace link
• Seek advice at a bicycle shop
• Re-true if possible, or replace
• Tighten mounting bolts
• Repair or replace chain ring/set
• Adjust derailleur travel
• Lubricate chain/Adjust chain link
• Adjust bearings/axle nut
• Adjust bottom bracket
• Replace bottom bracket axle or pedals
• Tighten crank bolts
• Adjust bearings
• Adjust bearings
• Adjust chain line
• Clean and lubricate jockey wheels
• Lubricate. If problem persists, replace
freewheel
• Replace brake blocks
• Clean blocks an rim
• Clean/adjust/replace cables
• Adjust brake levers
• Centre 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
• Centre brakes and/or adjust brake
block
• Toe-in
• Tighten headset
104
Possible solution
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