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![Giant Boulder SE mountain 21" frame 21 speed 26" wheels bike | eBay](https://i.ebayimg.com/images/g/RgcAAOSweIJjjSWv/s-l1600.jpg "Giant Boulder SE mountain 21" frame 21 speed 26" wheels bike | eBay")
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How Does a 21-Speed Bike Work? | livestrong
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