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Measurements

Gear Inch Chart

Gear Inches are used to give a numberical value to how a particular chainwheel/cog combination will feel. Classic BMX gearing evolved over the years to be 44/16,which has 55 gear inches. The most popu…
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Hub Measurements

Using these measurements, in addition to the ERD (Effective Rim Diameter) of the rim you intend to use, you can calculate, using the online spoke calculator from United Bicycle Institute (link), what …
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