Pirelli Scorpion Winter 2 is a winter tyre made in total of 53 sizes, ranging from R18 to R18 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 245/45 R20 is 20mm wider than the narrowest dimension (225) and 80mm narrower than the widest one (325). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (245mm), which results in 110.25mm sidewall height. In 245/45 R20, there is only one possible speed index for Pirelli Scorpion Winter 2 - "V", which is good for speeds up to 240 km/h. In 245/45 R20, Scorpion Winter 2 usually competes against Wintrac Pro, which is a tyre from Vredestein with a rating of 68%, compared to 83% of the Pirelli in question.