Federal Evoluzion ST-1 is a summer tyre made in total of 31 sizes, ranging from R16 to R16 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 245/40 R17 is 50mm wider than the narrowest dimension (195) and 30mm narrower than the widest one (275). 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 R17, there is only one possible speed index for Federal Evoluzion ST-1 - "Y", which is good for speeds up to 300 km/h. In 245/40 R17, Evoluzion ST-1 usually competes against Sport Master, which is a tyre from Linglong with a rating of 72%, compared to 36% of the Federal in question.