Falken Azenis FK510 SUV is a summer tyre made in total of 62 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/55 R18 is 20mm wider than the narrowest dimension (235) and 40mm narrower than the widest one (295). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (255mm), which results in 140.25mm sidewall height. In 255/55 R18, there is only one possible speed index for Falken Azenis FK510 SUV - "W", which is good for speeds up to 270 km/h. In 255/55 R18, Azenis FK510 SUV usually competes against Ecsta PS71 SUV, which is a tyre from Kumho with a rating of 64%, compared to 67% of the Falken in question.