Yokohama BluEarth-4S AW21 is a allround tyre made in total of 66 sizes, ranging from R14 to R14 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 255/50 R19 is 80mm wider than the narrowest dimension (175) and 10mm narrower than the widest one (265). 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 Yokohama BluEarth-4S AW21 - "W", which is good for speeds up to 270 km/h. In 255/50 R19, BluEarth-4S AW21 usually competes against Weather Control A005 EVO, which is a tyre from Bridgestone with a rating of 62%, compared to 31% of the Yokohama in question.