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A 21-speed bike is a type of bicycle that has 21 different gear combinations, allowing the rider to adjust the resistance and speed while pedaling. This type of bike is versatile and suitable for various terrains, as the different gear options make it easier to climb hills or ride on flat surfaces. Compared to single-speed or fixed-gear bikes, a 21-speed bike offers more flexibility and control over the riding experience.

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5mo ago

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