reference: R055:1981 1.6

ID: 00695

characteristic quantity showing the type (revolutions of the driving shaft or impulses) and the frequency of signals at which the speedometer must indicate a speed of 60 km/h. The speedometer constant may be expressed in revolutions per minute, rev/min, or in impulses per minute, imp/min. The speedometer constant is numerically equal to odometer constant k when the same driving system is used for both instruments