Bicycle wheel bearings are located inside the wheel hub. Though they are easily accessed on front wheels, you may need to remove the sprockets to access a rear wheel hub. If you’ve ever changed the bearings on a cup-and-cone style bottom bracket, you will recognize the similarities in many steps of this process.
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If your bike has a steel frame, steel wheels or any chrome-plated parts, you may find that rust grows quickly when you park or ride your bike out in the rain. Rust also spreads on steel chains, seat posts, handlebars, racks, brake and shifter cables and inside the frame.
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Different types of bicycles use different sizes of wheels. In general, modern bikes use 26-inch or 700c wheels, tires and tubes, of which 700c is larger. A bike wheel can accommodate a limited range of tire and tube widths, but getting the right tube diameter is essential for avoiding flat tires and ruined tubes.
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