Pirelli Night Dragon 240/40 R18

Pirelli Night Dragon is a summer tyre made in total of 13 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 240/40 R18 is 60mm wider than the narrowest dimension (180) and 0mm narrower than the widest one (240). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (240mm), which results in 96mm sidewall height.