Nokian zLine is a summer tyre made in total of 45 sizes, ranging from R16 to R16 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 225/50 R17 is 20mm wider than the narrowest dimension (205) and 20mm narrower than the widest one (245). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (225mm), which results in 112.5mm sidewall height. In 225/50 R17, there are 2 possible speed indexes for Nokian zLine - "W","Y", which are good for speeds up to 270, 300 km/h. In 225/50 R17, zLine usually competes against Powerproof, which is a tyre from Nokian with a rating of 51%, compared to 0% of the Nokian in question.
