2024 Audi Q8 tire size
Most common factory size
P285/45R21
- Factory sizes
- 1
- Across 3 trims
- Diameter
- 31.10 in
- Revs per mile
- 649
Tire sizes by trim
Source marks: one source
| Size | Trims | Width, mm | Sidewall, % of width | Rim, in | Diameter, in | Sidewall, in | Revs per mile |
|---|---|---|---|---|---|---|---|
| P285/45R21 | All 3 trims | 285 | 45 | 21 | 31.10 | 5.05 | 649 |
What P285/45R21 means
| Part | Number | Meaning |
|---|---|---|
| Type | P | Passenger car tire. |
| Width | 285 mm | Tread width. 11.2 in. |
| Sidewall | 45 | Sidewall height is 45% of the width. |
| Construction | R | Radial tire. |
| Rim | 21 in | Fits 21 in wheels. |
Other sizes that fit
Within 3% of the stock diameter. A common shop guideline, not a maker spec.
| Size | Rim, in | Diameter, in | Change | Speedo reads at 60 mph |
|---|---|---|---|---|
| 235/60R20 | 20 | 31.10 | +0.0% | 60.0 mph |
| 255/55R20 | 20 | 31.04 | -0.2% | 60.1 mph |
| 255/50R21 | 21 | 31.04 | -0.2% | 60.1 mph |
| 255/45R22 | 22 | 31.04 | -0.2% | 60.1 mph |
| 285/40R22 | 22 | 30.98 | -0.4% | 60.2 mph |
| 285/50R20 | 20 | 31.22 | +0.4% | 59.8 mph |
| 295/40R22 | 22 | 31.29 | +0.6% | 59.6 mph |
| 275/50R20 | 20 | 30.83 | -0.9% | 60.5 mph |
Checked against 292 factory sizes listed for 2009-2027 US models.
What this cannot tell you
Tire pressure is on the driver door sticker. Not in this data.
Optional wheel packages may differ.
- Two or more sources agree
- One source
- Model-level or estimate
- Sources differ