Gripmax SureGrip Pro Sport 275/50 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. 275/50 R21 is 70mm wider than the narrowest dimension (205) and 20mm narrower than the widest one (295). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (275mm), which results in 137.5mm sidewall height.