Where:
168 = Factor
RPM = Revolutions per minute of the motor
r = Rolling radius of loaded driving tyres in
inches
R = Overall gear reduction including both axle and transmission
Example:
Find the rolling radius of loaded driving tyre of a vehicle where the
overall gear reduction is 10, the miles per hour 15 and the engine speed
1680 RPM.
Where:
2651.51 = Factor
RPM = Revolutions per minute of the motor
r = Rolling radius of loaded driving tyres in millimetres
R = Overall gear reduction including both axle and transmission
Example:
Find the rolling radius of loaded driving tyre of a vehicle where the
overall gear reduction is 10, the kilometres per hour 20 and the engine
speed 1500 RPM.
