Kumho Ecsta Sport (PS72) is a summer tyre made in total of 79 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (205mm), which results in 82mm sidewall height. In 205/40 R18, there is only one possible speed index for Kumho Ecsta Sport (PS72) - "Y", which is good for speeds up to 300 km/h. In 205/40 R18, Ecsta Sport (PS72) usually competes against Potenza Sport, which is a tyre from Bridgestone with a rating of 91%, compared to 90% of the Kumho in question.