Michelin Latitude Sport 3 is a summer tyre made in total of 113 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 315/35 R20 is 90mm wider than the narrowest dimension (225) and 0mm narrower than the widest one (315). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (315mm), which results in 110.25mm sidewall height. In 315/35 R20, there are 2 possible speed indexes for Michelin Latitude Sport 3 - "Y","W", which are good for speeds up to 300, 270 km/h.