Originally Posted by Max-U52

The number of teeth in the gear has nothing to do with it, it's all about revolutions. If your pinion has to make two complete revolutions to make the connecting gear turn one revolution, that's a 2:1 ratio (or possibly 1:2, I always get that part mixed up). Like automotive rear ends that are referred to as 4:11 gears. That means that for every time your driveshaft turns 11 times your tires turn four times.