Kumho Ecsta PS71 is a summer tyre made in total of 125 sizes, ranging from R16 to R16 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 205/55 R17 is 10mm wider than the narrowest dimension (195) and 80mm narrower than the widest one (285). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (205mm), which results in 112.75mm sidewall height. In 205/55 R17, there is only one possible speed index for Kumho Ecsta PS71 - "W", which is good for speeds up to 270 km/h. In 205/55 R17, Ecsta PS71 usually competes against RainSport 3, which is a tyre from Uniroyal with a rating of 78%, compared to 79% of the Kumho in question.