Nokian Seasonproof SUV is a allround tyre made in total of 19 sizes, ranging from R16 to R16 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 255/50 R19 is 40mm wider than the narrowest dimension (215) and 0mm narrower than the widest one (255). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (255mm), which results in 127.5mm sidewall height. In 255/50 R19, there is only one possible speed index for Nokian Seasonproof SUV - "W", which is good for speeds up to 270 km/h. In 255/50 R19, Seasonproof SUV usually competes against Weather Control A005 EVO, which is a tyre from Bridgestone with a rating of 75%, compared to 62% of the Nokian in question.