2021 Porsche Cayenne tire size
Most common factory size
P285/40R21
- Factory sizes
- 3
- Across 12 trims
- Trims with it
- 6 of 12
- Diameter
- 29.98 in
- Revs per mile
- 673
Tire sizes by trim
Source marks: one source
| Size | Trims | Width, mm | Sidewall, % of width | Rim, in | Diameter, in | Sidewall, in | Revs per mile |
|---|---|---|---|---|---|---|---|
| P285/40R21 | GTS AWD, Coupe GTS AWD, Turbo AWD, Coupe Turbo AWD, Turbo S E-Hybrid AWD, Coupe Turbo S E-Hybrid AWD | 285 | 40 | 21 | 29.98 | 4.49 | 673 |
| P255/55R19 | AWD, E-Hybrid AWD, S AWD | 255 | 55 | 19 | 30.04 | 5.52 | 671 |
| P275/45R20 | Coupe AWD, Coupe E-Hybrid AWD, Coupe S AWD | 275 | 45 | 20 | 29.74 | 4.87 | 678 |
What P285/40R21 means
| Part | Number | Meaning |
|---|---|---|
| Type | P | Passenger car tire. |
| Width | 285 mm | Tread width. 11.2 in. |
| Sidewall | 40 | Sidewall height is 40% 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 |
|---|---|---|---|---|
| 255/40R22 | 22 | 30.03 | +0.2% | 59.9 mph |
| 255/45R21 | 21 | 30.04 | +0.2% | 59.9 mph |
| 255/50R20 | 20 | 30.04 | +0.2% | 59.9 mph |
| 285/35R22 | 22 | 29.85 | -0.4% | 60.2 mph |
| 285/45R20 | 20 | 30.10 | +0.4% | 59.8 mph |
| 235/55R20 | 20 | 30.18 | +0.7% | 59.6 mph |
| 275/45R20 | 20 | 29.74 | -0.8% | 60.5 mph |
| 235/50R21 | 21 | 30.25 | +0.9% | 59.5 mph |
| Size | Rim, in | Diameter, in | Change | Speedo reads at 60 mph |
|---|---|---|---|---|
| 255/60R18 | 18 | 30.05 | +0.0% | 60.0 mph |
| 255/50R20 | 20 | 30.04 | -0.0% | 60.0 mph |
| 235/65R18 | 18 | 30.03 | -0.1% | 60.0 mph |
| 285/45R20 | 20 | 30.10 | +0.2% | 59.9 mph |
| 235/60R19 | 19 | 30.10 | +0.2% | 59.9 mph |
| 235/55R20 | 20 | 30.18 | +0.4% | 59.7 mph |
| 275/55R18 | 18 | 29.91 | -0.4% | 60.3 mph |
| 275/50R19 | 19 | 29.83 | -0.7% | 60.4 mph |
| Size | Rim, in | Diameter, in | Change | Speedo reads at 60 mph |
|---|---|---|---|---|
| 245/45R21 | 21 | 29.68 | -0.2% | 60.1 mph |
| 275/50R19 | 19 | 29.83 | +0.3% | 59.8 mph |
| 275/40R21 | 21 | 29.66 | -0.3% | 60.2 mph |
| 245/50R20 | 20 | 29.65 | -0.3% | 60.2 mph |
| 225/60R19 | 19 | 29.63 | -0.4% | 60.2 mph |
| 245/55R19 | 19 | 29.61 | -0.5% | 60.3 mph |
| 285/40R21 | 21 | 29.98 | +0.8% | 59.5 mph |
| 255/45R21 | 21 | 30.04 | +1.0% | 59.4 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