Dunlop SP Sport Maxx Race 305/30 R20

Dunlop SP Sport Maxx Race is a summer tyre made in total of 18 sizes, ranging from R19 to R19 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 305/30 R20 is 70mm wider than the narrowest dimension (235) and 20mm narrower than the widest one (325). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (305mm), which results in 91.5mm sidewall height.