Temperatures measured on the tread are an excellent indicator for deciding the best choice of final compound and for optimising corneradjustments of the vehicle, such as camber and convergence.
We recommend measuring the temperature at three different points: Inner (innermost side of the vehicle), centre, outer tread.
In particular, average temperatures must be the ones shown in the table, the difference between the values measured internally, in the centre and externally must be maximum 20°, while the difference between the front and rear axles must be no more than 25°. If these values are exceeded, we recommend a different final compound should be used or the vehicle’s geometry should be adjusted.
Working pressures: Working pressure values depend on the size of the tyre in relation to the load that it is subjected to.
In other words, the pressure will vary according to the type of vehicle, its weight, the position of the engine, the aerodynamics and the conditions of use.
As the weight of the vehicle, the aerodynamic load, speed and acceleration that the tyre is subjected to increase, the working pressure must be increased.
Generally speaking, “heated up” working pressures vary from 1.9 to 2.2 bar for GT cars and 2.0 to 2.5 bar for tourism cars. Initial inflation pressures vary in order to obtain these values, depending on whether the tyres are preheated or used “cold”.
Indeed, preheated tyres can be inflated to lower values than cold tyres. The difference may amount to 0.3 to 0.5 bar, depending on the type of heater, the time it remains and the environmental conditions.
In any case, tyres should never be used below the minimum pressure value of 1.6 bar.
Attention: Using excessively low pressures would bring about the breaking of the tyre due to excess force on the sidewall and bead unseating from the rim.
The use of nitrogen or dry air to inflate the tyres means that the variation in pressure, as the temperature increases due to use, is limited, meaning greater precision in deciding optimal conditions of use.
