Falken Azenis FK520 is a summer tyre made in total of 128 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 235/45 R21 is 30mm wider than the narrowest dimension (205) and 90mm narrower than the widest one (325). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (235mm), which results in 105.75mm sidewall height. In 235/45 R21, there is only one possible speed index for Falken Azenis FK520 - "Y", which is good for speeds up to 300 km/h.
Relevant tyre tests in same or similiar dimension (235/45 R21)

| Name | |||||||
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| Falken Azenis FK520 | |||||||
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| Name | |||||||
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| Falken Azenis FK520 | |||||||
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| # | Name | Our rating | Tested in this dimension | Tested in same width dimension | Segment | Price |
|---|---|---|---|---|---|---|
| 1. | Michelin Pilot Sport 4 SUV | Premium | £248 101 Y + 1 | |||
| 2. | Goodyear Eagle F1 Asymmetric 6 | Premium | £194 101 H + 1 | |||
| 3. | Bridgestone Turanza 6 | Premium | £332 101 T | |||
| 4. | Hankook Ventus Prime 4 | Premium | £201 101 V + 3 | |||
| 5. | Nokian Powerproof 2 | Upper-middle | ||||
| 6. | Pirelli Scorpion Elect | Premium | £232 101 T |