Gripmax SureGrip Pro Sport 315/40 R21

Gripmax SureGrip Pro Sport is a summer tyre made in total of 119 sizes, ranging from R18 to R18 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/40 R21 is 110mm wider than the narrowest dimension (205) and -20mm narrower than the widest one (295). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (315mm), which results in 126mm sidewall height.