Nexen N Blue 4 Season 2 is a allround tyre made in total of 22 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 245/45 R18 is 40mm wider than the narrowest dimension (205) and 0mm narrower than the widest one (245). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (245mm), which results in 110.25mm sidewall height. In 245/45 R18, there is only one possible speed index for Nexen N Blue 4 Season 2 - "Y", which is good for speeds up to 300 km/h. In 245/45 R18, N Blue 4 Season 2 usually competes against Sport Master, which is a tyre from Linglong with a rating of 64%, compared to 62% of the Nexen in question.