Why Gearing Ratio Matters
Motorcycle Related
Gearing selection affects the acceleration and top speed of your motorcycle. Altering the relationship of the front sprocket to the rear sprocket will determine wheel speed for a given RPM. For example, if your motorcycle has a 16-tooth front sprocket and a 45-tooth rear sprocket the gearing ratio is 45/16 or 2.81. Installing a larger front sprocket or a smaller rear sprocket lowers this ratio, referred to as taller gearing, and offers the rider more speed at a given RPM.
Source: Automotive:Motorcycles