GEAR RATIOS

When one gear turns another, the speed that the two gears turn in relation to each other is the gear ratio.
Gear ratio is expressed as the number of rotations the drive gear must make in order to rotate the driven gear through one revolution.

To obtain a gear ratio, divide the number of teeth on the driven gear by the number of teeth on the drive gear.

Gear ratios, expressed relative to the number one, fall into three categories:
-Direct drive
-Gear reduction
-Overdrive