Nexen N Fera Primus is a summer tyre made in total of 44 sizes, ranging from R15 to R15 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 225/55 R17 is 40mm wider than the narrowest dimension (185) and 10mm narrower than the widest one (235). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (225mm), which results in 123.75mm sidewall height. In 225/55 R17, N Fera Primus usually competes against Primacy 4+, which is a tyre from Michelin with a rating of 77%, compared to 71% of the Nexen in question.