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January 26, 2015

January 26, 2015

Posted by **syd** on Tuesday, January 20, 2009 at 10:52pm.

- precalc -
**drwls**, Wednesday, January 21, 2009 at 7:09amThe fastest speed of the bike at a fixed pedal speed is achieved at the highest front/back sprocket or "gear" ratio of 40/12. Multiply that by 120 rev/min and pi*Diameter to get the top speed

(130 rev/min)*(40/12)*pi*(26/12 feet) = 2949.6 ft/min = 49.2 ft/s = 33.5 miles/h

Speeds with other gear combinations can be calculated similarly. The lowest speed is

(130 rev/min)*(24/28)*pi*(26/12 ft) = 758.5 ft/min = 8.6 mph at the same pedal speed. The actual speed will be slower still if the rider reduces the pedal rpm, as most riders do in the lowest gear

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