For all the money spent on upgrade engine performance parts, many riders overlook gearing which is a much simpler and inexpensive upgrade that can boost their motorcycle's acceleration. For a portion of the cost of a quality exhaust system, your acceleration from different speeds in every gear will increase significantly. You can even drop almost half a second from the quarter-mile and even add some mph all from changing your sprockets. By changing front and rear sprockets you can alter your motorcycle's final drive ratio, which then determines wheel speed for a given rpm. The term gearing ratio refers to the ratio of rear to front sprockets. Substituting a larger front or smaller rear sprocket lowers the ratio (also referred to as "taller" gearing) and there will be more speed for a given engine rpm. On the other hand, a smaller front or larger rear sprocket gives less speed for a given rpm (also referred to as "shorter" gearing).
From Hyperformanceparts.com
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