Re: Math question

Posted by PackardV8 On 2011/3/8 23:10:37

Use a compass with it's point at the hinge point of the PEDAL. Draw a 1.625 radius cricle ( 3.25" diameter). Using the same center point draw a circle with a 6" radius (12" diameter).

The pedal ratio will be the ratio between the CIRCUMFRENCEs of two circles (Edit: it's like figuring a gear ratio or a belt driven pulley ratio.):

Let Pi = 3.14., the geometric constant for circles.

Pi * 12 = 37.68.
Pi * 3.25 = 10.20.

37.68 / 10.20 = 3.7 pedal ratio.

It works out the same to just divide the 6 by 1.625 = 3.7.