Barum Polaris 6 is a winter tyre made in total of 78 sizes, ranging from R14 to R14 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 185/65 R15 is 30mm wider than the narrowest dimension (155) and 70mm narrower than the widest one (255). This tyre profile of 65 means the sidewall height of the tyre is 65% of the tyre width (185mm), which results in 120.25mm sidewall height. In 185/65 R15, there is only one possible speed index for Barum Polaris 6 - "T", which is good for speeds up to 190 km/h. In 185/65 R15, Polaris 6 usually competes against Primacy 4, which is a tyre from Michelin with a rating of 77%, compared to 0% of the Barum in question.