Gripmax SureGrip Pro Sport 285/30 R21

Gripmax SureGrip Pro Sport is a summer tyre made in total of 120 sizes, ranging from R18 to R18 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 285/30 R21 is 80mm wider than the narrowest dimension (205) and 70mm narrower than the widest one (355). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (285mm), which results in 85.5mm sidewall height.