Bridgestone Dueler H/P Sport is a summer tyre made in total of 118 sizes, ranging from R16 to R16 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 265/50 R19 is 60mm wider than the narrowest dimension (205) and 50mm narrower than the widest one (315). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (265mm), which results in 132.5mm sidewall height. In 265/50 R19, there are 2 possible speed indexes for Bridgestone Dueler H/P Sport - "Y","W", which are good for speeds up to 300, 270 km/h.