Vredestein Quatrac is a allround tyre made in total of 35 sizes, ranging from R15 to R15 - 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 40mm narrower than the widest one (225). 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 Quatrac - "H", which is good for speeds up to 210 km/h. In 185/55 R15, Quatrac usually competes against Quadraxer 3, which is a tyre from Kleber with a rating of 86%, compared to 92% of the Vredestein in question.