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Gain Ratios
Learn about the gearing system proposed by Sheldon Brown
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Gear Calculator
Learn how to use the original and most popular bicycle gear calculator for cyclists on the internet since 2009
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Gear Inches
Learn about the customary gearing system still in use today
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Gear Ratios
Learn about the fundamental gearing system on a bicycle
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Skid Patches
Learn about skid patches on brakeless fixed gear bicycles
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Tire Circumferences
Learn about the trivial inaccuracies of bicycle tire circumferences
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Tire Sizes
Learn about the international standard for labelling the size of tires
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Tire Size Converter
Learn how to use the new bicycle tire size converter