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A 21-speed bike is a type of bicycle that has 21 different gear combinations, allowing riders to adjust the resistance and speed while pedaling. This makes it versatile for various terrains and riding conditions. Compared to single-speed or fewer-speed bikes, a 21-speed bike offers more options for customization and efficiency in different situations, such as climbing hills or cruising on flat roads. This can enhance the overall performance and functionality of the bike, providing a smoother and more comfortable riding experience.

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