Cooper Zeon CS8 is a summer tyre made in total of 145 sizes, ranging from R15 to R15 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/55 R17 is 30mm wider than the narrowest dimension (185) and 40mm narrower than the widest one (255). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (215mm), which results in 118.25mm sidewall height. In 215/55 R17, there is only one possible speed index for Cooper Zeon CS8 - "W", which is good for speeds up to 270 km/h. In 215/55 R17, Zeon CS8 usually competes against Efficient Grip Performance, which is a tyre from Goodyear with a rating of 38%, compared to 34% of the Cooper in question. Latest test in 215/55 R17 was held by Gute-Fahrt in 2017, where Zeon CS8 received rating "Good -" and finished on the 9. place. It was tested on a .
