It is the difference between the free radius and the loaded radius of a tyre.

Abbreviation which certifies that the tyre conforms to the safety standards adopted by the United States, Canada and Australia (Department of Transportation). Tyres without this mark cannot be sold on these markets.

While driving, disturbing forces may modify the vehicle's trajectory whether it be on a straight line or on a bend. Drift angle is defined as the one between the trajectory that the wheel would describe without disturbing forces and the one really followed.

While driving disturbing forces may modify the vehicle's trajectory whether it be on a straight line or on a bend. Drift angle is defined as the one between the trajectory that the wheel would describe without disturbing forces and the one really followed.

It expresses the attitude of a tyre to oppose the drift effect on a bend. It is indicated by the ratio between the lateral force and the drift angle, for values tending to zero.

It includes a series of items of the dynamic behaviour of the vehicle according to the tyres it is fitted with, which have been appreciated by driving along a straight road at different speeds.

It is the wheel that not only supports the vehicle but also moves it because it is connected to the propulsion engine elements. A drive wheel can also be the leading wheel.

This is the more common case in practice. This imbalance is made up of the composition between static imbalance and torque imbalance. Balancing machines are commonly used for balancing a wheel.

Ratio between load and vertical deflection on the tyre when rotating, measured with the help of particular equipment, while the tyre vibrates vertically at low frequency.