Nokian zLine is a summer tyre made in total of 45 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/45 R18 is 30mm wider than the narrowest dimension (205) and 10mm narrower than the widest one (245). 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 R18, there is only one possible speed index for Nokian zLine - "W", which is good for speeds up to 270 km/h. In 235/45 R18, zLine usually competes against Powerproof, which is a tyre from Nokian with a rating of 54%, compared to 0% of the Nokian in question. Latest test in 235/45 R18 was held by ACE in 2018, where zLine received rating "Recommended" and finished on the 3. place. It was tested on a .
