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Old 09-06-08, 06:21 PM
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Join Date: Jan 2008
Location: Far NorthEast Texas
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Bikes: Trek SU200, old Wards Hawthorne 3-speed

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A little something extra:
For MAK- To convert from cadence(crank RPM) to speed in MPH, with 72 Gear Inches: multiply cadence by 0.2141992. Such as: RPM x 0.2141992 = speed in miles/hr. This is only good for 72 gear inches.

For something more generally useful: If you know Gear Inches(GI) and cadence(RPM), multiply by (Pi/1056), which is ~0.0029749. So: GI x RPM x 0.0029749 = speed in miles/hr.
UncleStu is offline