Goodyear UltraGrip Performance Gen-1 235/55 R18

Goodyear UltraGrip Performance Gen-1 is a winter tyre made in total of 102 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/55 R18 is 40mm wider than the narrowest dimension (195) and 40mm narrower than the widest one (275). 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.