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Trouble Shooting Tips For the Derailleur
Problem: The chain falls off while you
are shifting to the small chainring.
Solution: You can usually keep riding,
but pedal very gently and shift the derailleur. Hopefully,
the chain will shift back to the chainring.
Problem: When you stand to climb, the
chain rubs the derailleur.
Solution: Try adjusting the low-gear adjusting
screw so that there is more clearance between the cage and
the chain when in low gear.
Problem: When you stand to sprint, the
chain rubs the derailleur.
Solution: The chainring may be slightly
bent. Check it and have it trued if it is bent. Or you can
try adjusting the high-gear adjusting screw to provide more
clearance between the cage and the chain when in high gear.
Problem: The derailleur will not shift
to the smaller chainring.
Solution: Make sure the cable is moving
smoothly. Make sure the angle of the cage is parallel to
the chainrings, that the low-gear adjusting screw allows
the derailleur to move far enough to the inside, and that
the nose of the derailleur is slightly bent toward the chain.
Problem: The derailleur will not shift
to the larger chainring.
Solution: Check to see if the angle of
the cage is parallel to the chainrings, that the high-gear
adjusting screw allows the derailleur to move far enough
to the outside, and that the cage’s nose is slightly
bent toward the chain.
References
1. Langley, Jim. Bicycling Magazine’s Complete
Guide to Bicycle Maintenance and Repair or Road and Mountain
Bikes. Emmaus: Pennsylvania. 1999.
2. Milson, Fred. The Bike Book: Complete Step-By-Step
Guide to Choosing, Maintaining, and Repairing Your Bicycle.
Des Moines: Iowa. 1995.
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