Hankook Winter i*cept evo3 W330 is a winter tyre made in total of 88 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/30 R21 is 100mm wider than the narrowest dimension (215) and -60mm narrower than the widest one (255). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (315mm), which results in 94.5mm sidewall height. In 315/30 R21, there is only one possible speed index for Hankook Winter i*cept evo3 W330 - "V", which is good for speeds up to 240 km/h.