Kumho Ecsta PS31 is a summer tyre made in total of 46 sizes, ranging from R15 to R15 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/50 R17 is 30mm wider than the narrowest dimension (185) and 30mm narrower than the widest one (245). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (215mm), which results in 107.5mm sidewall height. In 215/50 R17, there is only one possible speed index for Kumho Ecsta PS31 - "W", which is good for speeds up to 270 km/h. In 215/50 R17, Ecsta PS31 usually competes against Dynaxer HP4, which is a tyre from Kleber with a rating of 76%, compared to 0% of the Kumho in question.