Falken Azenis FK510 is a summer tyre made in total of 114 sizes, ranging from R0 to R0 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 295/25 R20 is 40mm wider than the narrowest dimension (255) and -60mm narrower than the widest one (235). This tyre profile of 25 means the sidewall height of the tyre is 25% of the tyre width (295mm), which results in 73.75mm sidewall height. In 295/25 R20, there is only one possible speed index for Falken Azenis FK510 - "Y", which is good for speeds up to 300 km/h.