Riken All Season 185/55 R15

Riken All Season is a tyre made in total of 65 sizes, ranging from R13 to R13 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 185/55 R15 is 40mm wider than the narrowest dimension (145) and 20mm narrower than the widest one (205). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (185mm), which results in 101.75mm sidewall height.