Falken Azenis FK510 is a summer tyre made in total of 113 sizes, ranging from R17 to R17 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (205mm), which results in 112.75mm sidewall height. In 205/55 R17, there is only one possible speed index for Falken Azenis FK510 - "Y", which is good for speeds up to 300 km/h. In 205/55 R17, Azenis FK510 usually competes against Ventus S1 evo3 K127, which is a tyre from Hankook with a rating of 81%, compared to 74% of the Falken in question.