Semperit Speed-Grip 3 SUV is a winter tyre made in total of 15 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/45 R20 is 40mm wider than the narrowest dimension (235) and 0mm narrower than the widest one (275). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (275mm), which results in 123.75mm sidewall height. In 275/45 R20, there is only one possible speed index for Semperit Speed-Grip 3 SUV - "V", which is good for speeds up to 240 km/h. In 275/45 R20, Speed-Grip 3 SUV usually competes against UltraGrip Performance SUV Gen-1, which is a tyre from GoodYear with a rating of 69%, compared to 0% of the Semperit in question.