Royal Black Royalwinter UHP is a winter tyre made in total of 37 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/45 R18 is 40mm wider than the narrowest dimension (215) and 20mm narrower than the widest one (275). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (255mm), which results in 114.75mm sidewall height. In
255/45 R18, Black winter UHP usually competes against
Snowpower UHP, which is a tyre from
Tristar with a rating of 0%, compared to 16% of the
Royal in question.
Winter
