Gear Speed and Ratio
When two or more gears are in a mesh, one will drive the other. As such, one of the gears will be referred to as a driving gear and a driven gear.
Driving gear: This is the gear that transmits power, force or speed to the other gear.
Driven gear: This is the gear that receives the force, power or speed transmitted to it.
Gear ratio (GR): Gear ratio is the relationship between two gears in which one gear has larger speed than the other. It is the ratio of the number of teeth on the driver dear to that on the driven gear.
GR = T1:T2
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