Gripmax SureGrip Pro Sport 255/40 R20

Gripmax SureGrip Pro Sport is a summer tyre made in total of 119 sizes, ranging from R18 to R18 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/40 R20 is 50mm wider than the narrowest dimension (205) and 40mm narrower than the widest one (295). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height.