Hankook Ventus S1 evo3 SUV K127A is a summer tyre made in total of 86 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 325/30 R21 is 90mm wider than the narrowest dimension (235) and -30mm narrower than the widest one (295). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (325mm), which results in 97.5mm sidewall height. In 325/30 R21, there is only one possible speed index for Hankook Ventus S1 evo3 SUV K127A - "Y", which is good for speeds up to 300 km/h.