Perfect replica of the instruments of the series on the BSA, Norton and triumph deglia years 50-60. Perfect for a Cafe Racer classic style. Full scale gray K 1.0 - RATIO 1.1. Size upper diameter: 87mm smaller diameter: 79mm Height: 53mm to verify the relationship to the wheel (K) of your motorcycle proceed as follows: Calculation of K: K=10 X/U. X = number of revolutions that makes the speedometer cable by turning the wheel 10 times U=wheel circumference. Note Although most brands indicated ascend instruments with this report there may be some models which provide a different report, for this reason we always recommend to inform you on the relationship to the wheel provided on its own motion.