Dunlop SP Sport MAXX 315/35 R20

Dunlop SP Sport MAXX is a summer tyre made in total of 57 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 315/35 R20 is 100mm wider than the narrowest dimension (215) and -10mm narrower than the widest one (305). 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.