Universal mechanical odometer with black background and chromed steel body. It can be installed on most Japanese custom bikes. Very simple to install, it is equipped with a chromed bracket for fixing. Ø 60 mm. Ratio 2: 1 - K = 1,4: 1400 (speedometer cable revolutions) = 1km = 1400rpm = 60km / h. Threaded fixing pin Ø 12mm. To check the wheel ratio (K) of your motorcycle proceed as follows: Calculation of K: K = 10 X / U. X = number of turns made by the speedometer cable by turning the wheel 10 times U = wheel circumference. To learn more about the compatibility of mechanical odometers click here