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A way to figure out your gear ratio is this:
Take the number of teeth on the border of the idler gear and divide the number by 6 for the pinion gear's teeth. you get 3, so the pinion gear has to turn 3 times to make the idler gear turn once.
Now, take the number of teeth of the axle gear and divide that number by the idler gear's CENTER GEAR's number of teeth. The answer is number A.
Now take number A and multiply it by 3 to get your gear ratio.
EX: There are 6 teeth on the pinion gear, 18 teeth on the border of the idler gear, 6 teeth on the center of the idler gear, and 24 teeth on the rear axle gear. Divide 18 by 6, and 24 by 6. The answers are 3 and 4. Multiply 3 and 4 together and put the answer over /1, so you get a 12/1 or 12:1 gearing ratio.
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