Listed below are gear ratios for the EVO X 5-Speed Transmissions. The chart calculates vehicle speeds based on the gear ratio, final drive ratio, and tire size. As you can see, the upgraded 4.23:1 final drive ratio is 9.75% taller, per gear, than the standard OEM final drive! This chart has been updated to include the PPG 0.857 5th gear set. This ratio is closer to 4th gear, which will aid in keeping you within your power band while shifting into 5th.