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. 225/40 R18 is 50mm wider than the narrowest dimension (175) and 50mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (225mm), which results in 90mm sidewall height. In 225/40 R18, there is only one possible speed index for Nexen N´Fera Su4 - "W", which is good for speeds up to 270 km/h.
225/40 R18 is found on 51 vehicles: