Cooper Zeon CS8 is a summer tyre made in total of 121 sizes, ranging from R15 to R15 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 245/40 R19 is 60mm wider than the narrowest dimension (185) and 10mm narrower than the widest one (255). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R19, there is only one possible speed index for Cooper Zeon CS8 - "Y", which is good for speeds up to 300 km/h. In 245/40 R19, Zeon CS8 usually competes against Advantage, which is a tyre from BFGoodrich with a rating of 68%, compared to 42% of the Cooper in question.