FIGURE 1:
Parts of the bicycle drivetrain
The chain (Figure 1) connects the crankset to the cassette or rear cog.
This section explains how to inspect, adjust, and lubricate your chain.
Read the Warning about Mechanical Work before performing any mechanical work on your bicycle.
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FIGURE 1: Parts of the bicycle drivetrain |
Once a month check that the chain is clean, free of rust, and properly oiled. All links of the chain should pivot smoothly and without squeaking, and no links of the chain should be deformed. The chain pins (Figure 2) should extend the same distance from the chain plates on both sides of the chain.
Every 3 months check your chain for wear with a chain wear gauge or a ruler. Each full link (Figure 2) of a new chain measures one inch. If 12 links of your chain measures 12 1/8 inches (308mm) or more, the chain should be replaced. With good maintenance, a chain usually lasts 1000 to 1500 miles (1600-2400km) on a road bicycle, less on heavy-use bicycles like mountain bicycles, or if the chain is not kept clean and lubricated. As the chain becomes worn, it creates extra wear of other drivetrain components like the cassette and chainrings, so keep the chain in good condition and replace it when necessary. Replacing the chain takes special tools and training and should only be done by your Trek dealer.
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FIGURE 2: Parts of the chain |
For bicycles with a rear derailleur, the chain does not require adjustment.