Riken All Season 235/45 R18

Riken All Season is a tyre made in total of 62 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/45 R18 is 90mm wider than the narrowest dimension (145) and -30mm narrower than the widest one (205). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (235mm), which results in 105.75mm sidewall height.