Continental Wintercontact Ts860S is a winter tyre made in total of 48 sizes, ranging from R16 to R16 - this particular dimension is R22, which means it fits to a 22 inch/558.8mm diameter wheel. 255/40 R22 is 60mm wider than the narrowest dimension (195) and -40mm narrower than the widest one (215). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height. In 255/40 R22, there is only one possible speed index for Continental Wintercontact Ts860S - "V", which is good for speeds up to 240 km/h.