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 ...

However, a 7.17 gear set is not as strong as a 4.56 set, or any higher ratio for that matter. If high horsepower and high rpm are used in ... to know your tire size. True tire size is usually ...

The days of counting teeth in speedometer drives to correct for gear ratio changes and tire size are long gone ... raise the JK's idle speed up to 2000 rpm with the ProCal. After ten minutes ...

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 ...