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Pirelli
Pirelli PIR P-Zero (PZ4) Sport 285/40ZR20
Pirelli PIR P-Zero (PZ4) Sport 285/40ZR20
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The Pirelli P-Zero (PZ4) Sport in 285/40R20 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 285/40R20 means
In the size 285/40R20, 285 is the section width in millimeters (11.22 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 114.0 mm (4.49 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 28.98 inches, turning roughly 696 revolutions per mile. Overall diameter is what matters for speedometer accuracy and clearance when you change sizes, so compare it — not just the width — against your current tire.
The manufacturer lists the overall diameter of this specific tire as 20 inches — when clearance is tight, go by the published figure rather than the nominal size math.
The service description on this tire decodes to a load index of 108 — a maximum load of 2,205 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.
Specifications
| Size | 285/40ZR20 |
| Tire Type | High Performance |
| Service Description | 108Y |
| Load Index | 108 |
| Speed Rating | Y |
| Load Range | XL |
| Section Width (mm) | 285 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 20 |
| Tread Depth (/32") | 9 |
| Treadwear | 280 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 280AAA |
Frequently asked questions
What does 108Y mean on the Pirelli P-Zero (PZ4) Sport?
108Y breaks down as load index 108 — rated for 2,205 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.
What kind of tire is the Pirelli P-Zero (PZ4) Sport?
The Pirelli P-Zero (PZ4) Sport in 285/40R20 is a high performance tire.
What are the treadwear and warranty ratings on the Pirelli P-Zero (PZ4) Sport?
This tire carries a treadwear grade of 280, traction grade AA, temperature grade A under UTQG.
Keep shopping
See every Pirelli P-Zero (PZ4) Sport size, or view all tires at ThreePiece.us.
- BRAND:
- Pirelli
- Model:
- PIR P-Zero (PZ4) Sport
- Size:
- 285/40ZR20
- Aspect Ratio:
- 40
- Load Index:
- 108
- Load Range:
- XL
- Section Width:
- 285
- Service Description:
- 108Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 20
- Tire Type:
- High Performance
- Traction:
- AA
- Tread Wear:
- 280
- Tread Depth:
- 9
- UQTG:
- 280AAA
- Warranty:
- N/A
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