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# Hydraulic Motor Speed from MPH / KPH

IMPERIAL

The motor speed is obtained by multiplying 168 by the ratio of the power train by the miles per hour and dividing this sum by the rolling radius of the tyre.

Where:

168 = Factor

RPM = Revolutions per minute of engine

R = Overall gear reduction including both axle and transmission

MPH = Vehicle speed in miles per hour

Example:

Find the motor speed where the overall gear reduction is 10, vehicle speed is 15 MPH and rolling radius of driving tyre is 15 inches.

METRIC

The motor speed is obtained by multiplying 2651.51 by the ratio of the power train by the kilometres per hour and dividing this sum by the rolling radius of the tyre.

Where:

2651.51 = Factor

RPM = Revolutions per minute of engine

R = Overall gear reduction including both axle and transmission

KPH = Vehicle speed in kilometres per hour

Example:

Find the motor speed where the overall gear reduction is 10, vehicle speed is 20 KPH and rolling radius of driving tyre is 400 millimetres.