Nexen N fera Sport is a summer tyre made in total of 94 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 235/45 R20 is 30mm wider than the narrowest dimension (205) and 50mm narrower than the widest one (285). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (235mm), which results in 105.75mm sidewall height. In 235/45 R20, there is only one possible speed index for Nexen N fera Sport - "W", which is good for speeds up to 270 km/h. In 235/45 R20, N fera Sport usually competes against Quatrac Pro+, which is a tyre from Vredestein with a rating of 58%, compared to 67% of the Nexen in question.