Nokian Rotiiva AT Plus is a summer tyre made in total of 15 sizes, ranging from R16 to R16 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 285/70 R17 is 60mm wider than the narrowest dimension (225) and 20mm narrower than the widest one (305). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (285mm), which results in 199.5mm sidewall height. In 285/70 R17, there is only one possible speed index for Nokian Rotiiva AT Plus - "S", which is good for speeds up to 180 km/h.