Michelin Pilot Super Sport is a summer tyre made in total of 156 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 285/35 R20 is 80mm wider than the narrowest dimension (205) and 30mm narrower than the widest one (315). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (285mm), which results in 99.75mm sidewall height. In 285/35 R20, there is only one possible speed index for Michelin Pilot Super Sport - "Y", which is good for speeds up to 300 km/h. In 285/35 R20, Pilot Super Sport usually competes against Ultrac Vorti, which is a tyre from Vredestein with a rating of 55%, compared to 35% of the Michelin in question.