Joe Bauer: "to Each racer 56 tyres for dry asphalt and 28 rain are allocated, our problem - to watch that this rubber and structures was used only did not mix up among themselves. The main task - the control of number of the tyres used by the racer on a course of a weekend".

Commands have the right to change tyres in different complete sets of one specification. If the racer spoils one of wheels, having blocked it on braking, mechanics can replace only it, taking from the similar complete set, but usually, in case of a start or other problems which involve damage of two and more tyres, all complete set varies. The number of the used complete sets is supervised also, and the complete set is considered used when the racer crosses a line of departure with pit-lejn.