Gear ratio formula maths

[mark_airey]

If i understand correctly it should be as simple as multiplying the engine speed by rolling radius, then dividing by the total gear ratio, so:

(rpm x rolling radius) / (gear ratio x fd)
(4500 x 187) / (3.6 x 0.86)
841,500 / 3.096
271,802.33

This ^^^ is in cm/minute, so multiply by 60 to get the speed in cm per hour:

271,802.33 x 60 = 16,081,140

Then divide by 100,000 to get km/h

=160.8km/h, or near-as-dammit 100mph...


Ta-da!

Get you and the clever maths ness