Gripmax SureProWinter 325/40 R21

Gripmax SureProWinter is a winter tyre made in total of 4 sizes, ranging from R20 to R20 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 325/40 R21 is 30mm wider than the narrowest dimension (295) and 0mm narrower than the widest one (325). 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.