When you change the tire size on your Jeep from the original size, it will have a direct effect on your Jeep's power and handling. The chart listed below should assist you in selecting the optimum gear ratio to regain the performance for your Jeep.

When using the chart, determine your Jeep's original gear ratio and tire size, then follow the indicators to the intersection where you will find your Jeep's approximate RPMs at 65 MPH. The next step is to go to your proposed new tire size and follow that across to the closest RPM listing to your original one, then determine the gear ratio listed above. This proposed gear ratio would be a good choice to maintain the performance levels. If you are interested in improving your Jeep's power or it's fuel economy, you can then use the color codes as a guide for selecting another gear ratio.