Vredestein Sportrac 5 is a summer tyre made in total of 42 sizes, ranging from R14 to R14 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 185/55 R15 is 20mm wider than the narrowest dimension (165) and 50mm narrower than the widest one (235). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (185mm), which results in 101.75mm sidewall height. In 185/55 R15, there is only one possible speed index for Vredestein Sportrac 5 - "H", which is good for speeds up to 210 km/h. In 185/55 R15, Sportrac 5 usually competes against Sport BluResponse, which is a tyre from Dunlop with a rating of 71%, compared to 0% of the Vredestein in question.