Division 8 Calculating n/v ratiosF1

is engine speed, min^{– 1};

is the vehicle speed, km/h;

is the transmission ratio in gear i;

is the axle transmission ratio.

is the dynamic rolling circumference of the tyres of the drive axle and is calculated using the following equation:

$U_{\mathrm{dyn}}=\mathrm{3,05}\times \left(2\left(\frac{H∕W}{100}\right)\times W+\left(R\times \mathrm{25,4}\right)\right)$

where:

is the tyre's aspect ratio, e.g. ‘45’ for a 225/45 R17 tyre;

is the tyre width, mm; e.g. ‘225’ for a 225/45 R17 tyre;

is the wheel diameter, inch; e.g. ‘17’ for a 225/45 R17 tyre.