- A method for estimating the wear of the tread of a pneumatic tyre that provides for calculating, during a test step, a quantity (WS) that is indicative of the percentaged ratio of the remaining thickness of the tread in relation to the thickness of the tread from new using the formula: WS = 1 2 π * OTD TD Re v − C + 1 * 100 wherein: WS quantity that is indicative of the percentaged ratio of the state of wear of the tread of the pneumatic tyre; OTD thickness of the tread from new (when the tread is not worn); TD distance traveled by the pneumatic tyre during the test step; Rev current number of revolutions of the pneumatic tyre that are required in order to travel said distance (TD); C NEW circumference of the tread from new (when the tread is not worn); variable as a function of the inflation pressure (P) of pneumatic tyre; wherein, when the inflation pressure (P) of the pneumatic tyre is different than the nominal inflation pressure (P N ), the circumference (C) of the tread from new is calculated using the formula: C NEW = C 0 + K * P wherein: C NEW circumference of the tread from new (when the tread is not worn) when the inflation pressure (P) of the pneumatic tyre is different than the nominal inflation pressure (P N ); C 0 circumference of the tread when the pneumatic tyre is deflated; K coefficient of correlation; and P relative inflation pressure of the pneumatic tyre; wherein the coefficient of correlation (K) is calculated using the formula: K = C NEW − C 0 / P N wherein: C NEW circumference of the tread from new (when the pneumatic tyre is not worn) and under nominal inflation pressure (P N ) conditions; C 0 circumference of the tread when the pneumatic tyre is deflated; K coefficient of correlation; and P N relative nominal inflation pressure of the pneumatic tyre. WS quantity that is indicative of the percentaged ratio of the state of wear of the tread of the pneumatic tyre; OTD thickness of the tread from new (when the tread is not worn); TD distance traveled by the pneumatic tyre during the test step; Rev current number of revolutions of the pneumatic tyre that are required in order to travel said distance (TD); C NEW circumference of the tread from new (when the tread is not worn); variable as a function of the inflation pressure (P) of pneumatic tyre; wherein, when the inflation pressure (P) of the pneumatic tyre is different than the nominal inflation pressure (P N ), the circumference (C) of the tread from new is calculated using the formula: C NEW = C 0 + K * P wherein: C NEW circumference of the tread from new (when the tread is not worn) when the inflation pressure (P) of the pneumatic tyre is different than the nominal inflation pressure (P N ); C 0 circumference of the tread when the pneumatic tyre is deflated; K coefficient of correlation; and P relative inflation pressure of the pneumatic tyre; C NEW circumference of the tread from new (when the tread is not worn) when the inflation pressure (P) of the pneumatic tyre is different than the nominal inflation pressure (P N ); C 0 circumference of the tread when the pneumatic tyre is deflated; K coefficient of correlation; and P relative inflation pressure of the pneumatic tyre; wherein the coefficient of correlation (K) is calculated using the formula: K = C NEW − C 0 / P N wherein: C NEW circumference of the tread from new (when the pneumatic tyre is not worn) and under nominal inflation pressure (P N ) conditions; C 0 circumference of the tread when the pneumatic tyre is deflated; K coefficient of correlation; and P N relative nominal inflation pressure of the pneumatic tyre. C NEW circumference of the tread from new (when the pneumatic tyre is not worn) and under nominal inflation pressure (P N ) conditions; C 0 circumference of the tread when the pneumatic tyre is deflated; K coefficient of correlation; and P N relative nominal inflation pressure of the pneumatic tyre. <EOS>