Uniroyal MS plus 77 is a winter tyre made in total of 76 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/40 R18 is 80mm wider than the narrowest dimension (145) and 30mm narrower than the widest one (255). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (225mm), which results in 90mm sidewall height. In 225/40 R18, there is only one possible speed index for Uniroyal MS plus 77 - "V", which is good for speeds up to 240 km/h. In 225/40 R18, MS plus 77 usually competes against WR Snowproof, which is a tyre from Nokian with a rating of 55%, compared to 55% of the Uniroyal in question.
