The bicycle chain is responsible for generating movement on your bike. It does this by transferring your pedalling energy to the rear wheel of the bike. Your chain converts your pedalling energy into forward motion based on the gear you have selected.
Chains are incredibly energy efficient components. Some research studies have shown chains to have an energy efficiency score of 98%. This means that when you ride your pedalling energy is being optimised by your chain to propel you forward.
It’s important to buy the right type of chain for your bike. If you ride a geared bike than a multi-speed chain that is compatible with your drive train is the correct choice. It’s also important to make sure your chain is compatible with the brand of components you are using
A bicycle chain is a 'roller chain' that has the task of transferring power from the cranks to the rear wheel of the bike thus propelling it. Most bicycle chains are made from alloy steel, but some are chrome plated or stainless steel to prevent rust, or simply for good looks. Chains will vary in width depending on the amount of gears you have, most are 3/32 inch for use with geared systems and then come in 'speeds' which needs to matched to the cassette, ie a 10 speed cassette will need a 10 speed chain and so on. Track bikes or single speeds often run 1/8 inch rings so will need a 1/8 inch chain as well, these will have larger plates to aid stopping on a fixed wheel, which can add extra stress to a chain.
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