Nexen WinGuard Sport 2 WU7 is a winter tyre made in total of 90 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/40 R18 is 30mm wider than the narrowest dimension (195) 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 WinGuard Sport 2 WU7 - "V", which is good for speeds up to 240 km/h. In 225/40 R18, WinGuard Sport 2 WU7 usually competes against Winter Sport 5, which is a tyre from Dunlop with a rating of 88%, compared to 38% of the Nexen in question.
