= (336/Tire Diameter) x MPH x Gear Ratio x Overdrive Ratio
= (TireDiameter x RPM) / (336 x Gear Ratio x Overdirve Ratio)
Ratio = (TireDiameter x RPM) / (336 x MPH x Overdrive
Load (lb.) = GVWR x .75
Assume that as much as 75 percent of the
Gross Vechile Weight Rating (GVWR) can be put on either
the front or rear axle, with a bit of a saftey margin.