Pirelli Night Dragon 240/40 R18

Pirelli Night Dragon is a summer tyre made in total of 20 sizes, ranging from R13 to R13 - 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 -140mm narrower than the widest one (100). 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.