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The chain on a city bike is a crucial part of the drivetrain that connects the chainrings at the front and the cassette at the rear, helping transfer the rider's pedaling power to the wheels. Here is a description of its function and main characteristics:

1. Power transmission:

The main function of the chain is to transfer the force exerted by the rider on the pedals to the wheels of the bicycle, which helps propel the bicycle forward.

2. Compatibility:

It is important to choose a chain compatible with the bike's transmission system, particularly with the number of speeds on the cassette and chainrings. Chains are available in different widths to accommodate the different speed numbers of modern drivetrains.

3. Durability and wear resistance:

City bike chains are usually made from specially treated alloy steel to provide good durability and wear resistance, even in harsh urban riding conditions.

4. Maintenance:

To ensure optimal operation of the transmission, it is important to keep the chain clean and properly lubricated. Regular maintenance, such as cleaning and oiling the chain, can extend its life and reduce premature wear.

5. Flexibility:

Bicycle chains are designed to be flexible enough to pass over the various cassette sprockets and front chainrings without causing operational problems.

6. Links and rivets:

A chain is made up of links connected together by rivets. Some types of chains may be designed with special links to make them easier to open and close when it is necessary to remove them for maintenance or replacement.

7. Length:

The length of the chain must be adapted to the geometry of the bicycle frame and the number of teeth of the sprockets and chainrings. A chain that is too long can be prone to chain skipping, while a chain that is too short can cause premature wear of drivetrain components.

In summary, the chain of a city bike is an essential component of the drivetrain that helps transfer the cyclist's pedaling power to the bike's wheels. It is designed to be durable, compatible with the bike's transmission system and requires regular maintenance to ensure optimal operation.

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