Michelin CrossClimate 2 SUV is a allround tyre made in total of 47 sizes, ranging from R17 to R17 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 255/50 R19 is 30mm wider than the narrowest dimension (225) and 20mm narrower than the widest one (275). 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 are 2 possible speed indexes for Michelin CrossClimate 2 SUV - "T","Y", which are good for speeds up to 190, 300 km/h.