Riken Ultra High Performance 245/35 R18

Riken Ultra High Performance is a tyre made in total of 55 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 245/35 R18 is 40mm wider than the narrowest dimension (205) and -50mm narrower than the widest one (195). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (245mm), which results in 85.75mm sidewall height.