Uniroyal MS plus 77 is a winter tyre made in total of 76 sizes, ranging from R13 to R13 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/50 R17 is 70mm wider than the narrowest dimension (145) and 40mm narrower than the widest one (255). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (215mm), which results in 107.5mm sidewall height. In 215/50 R17, there is only one possible speed index for Uniroyal MS plus 77 - "V", which is good for speeds up to 240 km/h. In 215/50 R17, MS plus 77 usually competes against KRISALP HP3, which is a tyre from Kleber with a rating of 69%, compared to 0% of the Uniroyal in question.