Nokian Powerproof 2 is a summer tyre made in total of 91 sizes, ranging from R16 to R16 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 235/45 R21 is 30mm wider than the narrowest dimension (205) and 80mm narrower than the widest one (315). 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.
Summer
Summer
Summer
Summer