Goodyear UltraGrip Performance Gen-1 235/50 R18

Goodyear UltraGrip Performance Gen-1 is a winter tyre made in total of 101 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/50 R18 is 40mm wider than the narrowest dimension (195) and 40mm narrower than the widest one (275). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (235mm), which results in 117.5mm sidewall height.