How Do You Find The Gear Ratio?
The gear ratio is a numerical ratio that describes the relationship between two gears. It is a simple, objective way to define the different ratios at which two gears are turning relative to one another. For example, a large gear that takes 10 times as long to make a full rotation as a smaller gear would be said to have a 10:1 ratio with the smaller gear. Count the number of teeth in the larger gear, also called the idler gear. For the sake of example, let’s say the idler gear has 30 teeth. Count the number of teeth on the smaller gear, also called the pinion. For the sake of example, let’s say that the pinion has 20 teeth. Make a fraction with the idler gear’s number of teeth on top, and the pinion’s number of teeth on bottom. In our example, the fraction is 30/20. Reduce the fraction to its simplest form. The simplest form of 30/20 is 3/2, or 1.5. The gear ratio is determined by taking this number, 1.5, and putting it over 1. 1.5:1 is the gear ratio from our example. This means that
