Cooper Zeon 4XS Sport is a summer tyre made in total of 145 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/55 R18 is 40mm wider than the narrowest dimension (215) and 40mm narrower than the widest one (295). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (255mm), which results in 140.25mm sidewall height. In 255/55 R18, there are 2 possible speed indexes for Cooper Zeon 4XS Sport - "V","Y", which are good for speeds up to 240, 300 km/h. In 255/55 R18, Zeon 4XS Sport usually competes against Roadhawk, which is a tyre from Firestone with a rating of 57%, compared to 26% of the Cooper in question. Latest test in 255/55 R18 was held by Autobild in 2020, where Zeon 4XS Sport received rating "Satisfactory" and finished on the 8. place. It was tested on a BMW X5.
