Falken Azenis RS820 is a summer tyre made in total of 19 sizes, ranging from R19 to R19 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 275/40 R19 is 50mm wider than the narrowest dimension (225) and 20mm narrower than the widest one (295). 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 Falken Azenis RS820 - "Y", which is good for speeds up to 300 km/h. In 275/40 R19, Azenis RS820 usually competes against Proxes Sport 2, which is a tyre from Toyo with a rating of 63%, compared to 57% of the Falken in question.