Riken Road-Terrain 285/60 R18

Riken Road-Terrain is a tyre made in total of 15 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 285/60 R18 is 50mm wider than the narrowest dimension (235) and 0mm narrower than the widest one (285). This tyre profile of 60 means the sidewall height of the tyre is 60% of the tyre width (285mm), which results in 171mm sidewall height.