Continental SportContact 5 SUV is a summer tyre made in total of 93 sizes, ranging from R18 to R18 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/45 R20 is 60mm wider than the narrowest dimension (215) and 20mm narrower than the widest one (295). 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 are 2 possible speed indexes for Continental SportContact 5 SUV - "Y","V", which are good for speeds up to 300, 240 km/h.