Gripmax SureGrip Pro Sport 305/35 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. 305/35 R21 is 100mm wider than the narrowest dimension (205) and -10mm narrower than the widest one (295). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (305mm), which results in 106.75mm sidewall height.