Hankook W462 Winter i*cept RS3 is a winter tyre made in total of 77 sizes, ranging from R14 to R14 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 185/55 R15 is 20mm wider than the narrowest dimension (165) and 40mm narrower than the widest one (225). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (185mm), which results in 101.75mm sidewall height. In 185/55 R15, there are 2 possible speed indexes for Hankook W462 Winter i*cept RS3 - "T","H", which are good for speeds up to 190, 210 km/h.