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To the untrained eye, most bike chains look the same. But pull two bikes off the road and compare the chains and you'll likely find that they have different chains, designed specifically to work with the bikes' particular components.
For example, a 1/8-inch-wide chain is designed to work with kids' single-speed, fixed-gear, and three-speed bikes (basically most bicycles without a rear derailleur). The majority of bikes use a 3 /32-inch-wide chain. However, knowing the width is not enough. You need to purchase a chain that is designed to work with the number of cogs on your bike. If you tell someone in your local bike store how many cogs are on your bike, they can help you find the right chain.
Here are the two major types of chains you're likely to find:
SRAM PowerLinkâtype chains: SRAM PowerLink and other similar types of chains resemble the old master-link chains found on single-speed bikes. You may remember these from when you were a kid (if you were a kid in the '60s or '70s).
Shimano- and Campagnolo-type chains: Most bikes have chains that fall into this category. Shimano- and Campagnolo-type chains use a special replacement pin for installation.
Chains with reusable rivets: This type of chain uses reusable rivets, which are partially pressed out of the chain during separation and then pressed back in with a chain tool. This saves you from having to keep special replacement pins handy.
If you're replacing a chain, make sure you choose one that matches the number of cogs on your cassette. If you choose the wrong size chain, you may have shifting troubles. It's also important to identify whether you have a drivetrain that requires a specially designed chain. For example, Shimano makes a Hyperglide line of products that include specially shaped cogs that facilitate shifting. When in doubt, take your bike into your local bike shop so that they can quickly tell you which kind of chain you need.

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