Pirelli P Zero Trofeo R is a summer tyre made in total of 4 sizes, ranging from R18 to R18 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 265/35 R18 is 30mm wider than the narrowest dimension (235) and -20mm narrower than the widest one (245). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (265mm), which results in 92.75mm sidewall height. In 265/35 R18, there is only one possible speed index for Pirelli P Zero Trofeo R - "Y", which is good for speeds up to 300 km/h. In 265/35 R18, P Zero Trofeo R usually competes against Ventus S1 evo3 K127, which is a tyre from Hankook with a rating of %, compared to 68% of the Pirelli in question.