Barum Quartaris 5 is a allround tyre made in total of 46 sizes, ranging from R13 to R13 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 185/55 R15 is 30mm wider than the narrowest dimension (155) 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 Barum Quartaris 5 - "H", which is good for speeds up to 210 km/h. In 185/55 R15, Quartaris 5 usually competes against Quadraxer 2, which is a tyre from Kleber with a rating of 61%, compared to 70% of the Barum in question.