Universal mechanical odometer Ø 60 mm with white background and black steel body. Backlit with white light. Complete with fixing bracket. Ratio to the wheel K = 1.0. Threaded fixing pin Ø 12mm. NB Not compatible with the original Moto Guzzi odometer cable To check the ratio to the wheel (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