Nexen N´Fera Su4 255/40 R18

Nexen N´Fera Su4 is a tyre made in total of 43 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/40 R18 is 80mm wider than the narrowest dimension (175) and 20mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height.