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. 275/40 R19 is 100mm wider than the narrowest dimension (175) and -10mm narrower than the widest one (265). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (275mm), which results in 110mm sidewall height. In 275/40 R19, there is only one possible speed index for Yokohama BluEarth-4S AW21 - "Y", which is good for speeds up to 300 km/h. In 275/40 R19, BluEarth-4S AW21 usually competes against Weather Control A005 EVO, which is a tyre from Bridgestone with a rating of 61%, compared to 31% of the Yokohama in question.