Gripmax SureGrip Pro Sport 325/40 R21

Gripmax SureGrip Pro Sport is a summer tyre made in total of 98 sizes, ranging from R18 to R18 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 325/40 R21 is 120mm wider than the narrowest dimension (205) and -30mm narrower than the widest one (295). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (325mm), which results in 130mm sidewall height.