Falken Azenis FK510 is a summer tyre made in total of 112 sizes, ranging from R17 to R17 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/40 R17 is 10mm wider than the narrowest dimension (205) and 80mm narrower than the widest one (295). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (215mm), which results in 86mm sidewall height. In 215/40 R17, Azenis FK510 usually competes against Ecsta PS71, which is a tyre from Kumho with a rating of 68%, compared to 71% of the Falken in question.