Figure 1:
Parts of the bicycle drivetrain
The cassette (Figure 1) or rear cog (Figure 2) is the connection between the chain and the rear wheel.
This section explains how to inspect, adjust, and lubricate your cassette or rear cog.
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Figure 1: Parts of the bicycle drivetrain |
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Figure 2: Track hub with two sides, each with a rear cog |
Once a month check that the cassette or rear cog is clean, free of rust, and properly oiled. Take off the rear wheel, and rotate the cassette or rear cog in your hands. If you hear a grinding noise or your cassette or rear cog stops immediately after spinning it, the cassette or rear cog may need adjustment or replacement; take your bicycle to your Trek dealer for service.
Every 3 months check that the cassette or rear cog is tight. Attempt to move the largest cassette cog or rear cog from side to side. If there is any movement, tighten to the torque specifications.
Adjustment of the bearings in the cassette requires special tools and training. These services should only be performed by your Trek dealer.
Once a month clean the cassette or rear cog.
Remove the surface dirt around the cog teeth with a degreaser or a similar solvent, and a brush. Do not use gasoline; it's too flammable and leaves a grease-contaminating film after evaporating.
Many solvents can damage the wheel bearings or the finish of your bicycle. Always remove the cassette or rear cog from the wheel before cleaning.
