Vehicle speed (mph), engine speed (rpm), tire diameter (inches), trans gear ratio, and rear axle gear ratio are all interrelated. If you know four out of five of these values, you can determine ...

Resorting to the "guessing method" may work some of the time, but there is a better way; it involves a calculator and a mathematical formula. Basically, the lowest gear ratio possible (a higher ...

If you were smart, you would have referenced all your calculations properly so you could just delete the 4.3 in the final drive cell and replace it with 4.11, 3.9, or whatever other gear ratio you ...

So if our truck had 30-inch tires stock, and a 3.73:1 axle ratio, that calculation would tell us we need a 4.103:1 (which rounds off to the readily available 4.10:1) gear ratio to get us back to ...

A standard Formula E racer's electric motor can rev to 20,000 rpm. By doing some math to solve for the racer's gear ratio, it works out to show a single gear with an 11.4:1 ratio can reach 225 kph ...