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A 7-speed bicycle has 7 different gear options, while a 21-speed bicycle has 21 gear options. The more gears a bicycle has, the more versatile it is in handling different terrains and riding conditions. A 21-speed bike offers a wider range of gear ratios, allowing for better performance on hills and varying terrain. It also provides more options for adjusting speed and cadence, making it more suitable for different riding styles and preferences.

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