Re: Can someone help me?

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Posted by Dan O on November 29, 2000 at 10:07:00:

In Reply to: Can someone help me? posted by Alwyn Spencer on November 27, 2000 at 11:49:06:

Notwithstanding you know the mechanism of the derailleur
is to simply select between the gears, the issue the mechanism
affects is the final ratio of the number of times the wheel goes
around beyond compared to the number of times the pedal crank
goes around is strictly the ratio of the numbers of teeth on
the front sprocket to the number of teeth on the rear sprocket,
so you divide one by the other. Depending on which ratio you
wish to express, crank turns per wheel revolution, or revolutions
per crank turns, you put either the front or the back sprocket
in the numerator of the fraction. example: 20t front 40t back.
ratio of wheel turns to crank turn is 2:1 (40/20 reduced to lowest
terms), ratio of crank turns to wheel turn is 1:2,
(20/40 reduced to lowest terms). Gear ratio is nothing other
than considering numbers of respective teeth.

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