Cassette Cog Maintenance
Removing
Cassette Cogs (allow you to coast while pedaling
has stopped)
The first step is to remove the rear wheel as previously explained.
Unscrew either the lock ring or the smallest cog (depending
on the model) using a cog removal tool. Remove the entire
cog unit to fix a spoke or remove certain cogs that need to
be replaced. Remember how the unit fit on the hub for reinstallment.
Trouble
Shooting Tips For Cassettes
Problem: When installing a cassette, it doesn’t
fit on the cassette hub.
Solution: You need to be sure to match the
cassette spline to the hub spline as it will only fit one
way.
Problem: Shifting is not as accurate as
it once was.
Solution: Check to see if the cassette
lockring is tight.
Problem: When pedaling, there is a feeling
that the gears are skipping and there is an associated sound.
Solution: This usually occurs when a cog
is worn. Try to figure out which cog it is and replace it.
Skipping can also be caused by debris getting jammed in
between cogs.
Problem: There is a creaking sound coming
from the rear wheel.
Solution: Remove the cogs and grease the
splines that the cogs sit on, then reinstall the cogs and
tighten the lockring.
Problem: Pedaling feels rough.
Solution: The chain is dirty or dirt has
gotten in the cassette bearings. You need to flush it out
with something like WD-40, and then apply a medium-weight
oil. Repeat this process until it runs smooth.
Problem: The shifting isn’t as precise
as before you disassembled and cleaned the cassette.
Solution: Make sure the spacers are installed
correctly and that all the spacers are reinstalled. Also,
there should be the same size gaps between each pair of
cogs. If not, the shifting will not work correctly.
Problem: The derailleur will not shift
onto one of the larger cogs.
Solution: You may have installed a cog
backwards, and the ramps on the teeth cannot pick up the
chain when you shift. Try flipping the cog.
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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