Hankook Dynapro AT-M RF10 is a summer tyre made in total of 34 sizes, ranging from R15 to R15 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 235/75 R15 is 40mm wider than the narrowest dimension (195) and 20mm narrower than the widest one (255). This tyre profile of 75 means the sidewall height of the tyre is 75% of the tyre width (235mm), which results in 176.25mm sidewall height. In 235/75 R15, there are 2 possible speed indexes for Hankook Dynapro AT-M RF10 - "R","T", which are good for speeds up to 170, 190 km/h.