Vehicle Speed V Calculating

V = n/i-tot X UA X 0.06

n = Engine speed (RPM)
i-tot = Overall ratio
UA = Dynamic roll circumference of tires (m)
V = Vehicle speed (km/h)

Example:
V = 1000/3.100 X 1.93 X 0.06 = 37 km/h

(At an engine speed of 1000 RPM, the vehicle road speed in 5th gear is 37 km/h)