Hankook Ventus Prime 4 is a summer tyre made in total of 152 sizes, ranging from R16 to R16 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 245/40 R17 is 60mm wider than the narrowest dimension (185) and -30mm narrower than the widest one (215). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R17, there is only one possible speed index for Hankook Ventus Prime 4 - "Y", which is good for speeds up to 300 km/h. In 245/40 R17, Ventus Prime 4 usually competes against Turanza 6, which is a tyre from Bridgestone with a rating of 83%, compared to 81% of the Hankook in question.