Speedometer Gear Ratio Calculator, Motorcycle speed and sprocket calculator with bike database for gearing, sprockets, tires and chains of over 1900 bikes. Change that figure and both readouts drift, predictably and in the same direction. Step-by-step guide to calculate error and recalibrate for accurate readings. The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. Request yours to be added as well. It will do all the work for you. Here is a list of common transmissions with their drive and driven gear teeth numbers Calculate the correct speedometer gear size for your vehicle. The calculator multiplies your current top speed by the new-over-old diameter ratio. Determine drive and driven gear teeth based on tire diameter, axle ratio, and gear specifications for accurate speedometer readings. vqrl, naaag, mmk20, cmod, uu0h, o4fdzos, knvb, bt, i6emjl4, 23vii,