Barum Polaris 3 is a winter tyre made in total of 65 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 50mm wider than the narrowest dimension (135) and 60mm narrower than the widest one (245). 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 Polaris 3 - "T", which is good for speeds up to 190 km/h. In 185/55 R15, Polaris 3 usually competes against Radial Champiro WinterPro 2, which is a tyre from GT with a rating of 60%, compared to 0% of the Barum in question.
