Goodyear Efficientgrip 235/55 R18

Goodyear Efficientgrip is a summer tyre made in total of 109 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/55 R18 is 50mm wider than the narrowest dimension (185) and 50mm narrower than the widest one (285). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (235mm), which results in 129.25mm sidewall height.