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A bike chain guide is a device that is used to keep the chain running smoothly and securely on the chain ring and the rear cassette, particularly in rough off-road conditions or while performing stunts and tricks. They are handy for mountain biking, where the rough terrain can cause the chain to slip or fall off the chain ring.
Different types of chain guides available
There are several different types of chain guides available, but they all serve the same basic function of keeping the chain on the chain ring and rear cassette. Some popular types of chain guides include:
Upper guides: these are installed above the chain ring and use a roller or guide to keep the chain on the chain ring.
Lower guides: these are installed below the chain ring and use a roller or guide to keep the chain on the rear cassette.
Full guides: these are a combination of upper and lower guides, providing protection for both the chain ring and the rear cassette.
Chain guides can be made from various materials, including aluminium, carbon fibre, and plastic. They typically attach to the bike's frame and are adjustable to fit different chainring and cassette sizes.
When choosing a chain guide, it's important to make sure that it is compatible with the rest of your drivetrain, including the chain ring and rear cassette, as well as your bike's frame. It's also important to ensure that the guide is adjustable for proper chain tension and clearance.
It's also important to note that chain guides can add weight to the bike and can make it slightly less efficient than without one.