Gripmax SureGrip Pro Sport 305/25 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. 305/25 R21 is 100mm wider than the narrowest dimension (205) and -10mm narrower than the widest one (295). This tyre profile of 25 means the sidewall height of the tyre is 25% of the tyre width (305mm), which results in 76.25mm sidewall height.