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Pirelli
Pirelli P-Zero (PZ4) Sport 285/40R21XL 109W - 3805900
Pirelli P-Zero (PZ4) Sport 285/40R21XL 109W - 3805900
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Looking for a 285/40R21 summer tire? The Pirelli P-Zero (PZ4) Sport is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 285/40R21 means
In the size 285/40R21, 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 21 is the wheel diameter in inches. That works out to an overall diameter of about 29.98 inches, turning roughly 673 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 service description on this tire decodes to a load index of 109 — a maximum load of 2,271 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Load Range E corresponds to a 10-ply rating.
Specifications
| Size | 285/40R21XL |
| Tire Type | Summer |
| Service Description | 109W |
| Load Index | 109 |
| Speed Rating | W |
| Load Range | Extra Load |
| Section Width (mm) | 285 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 29.96 |
| Tread Depth (/32") | 9 |
| Treadwear | 280 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 280AAA |
Frequently asked questions
What kind of tire is the Pirelli P-Zero (PZ4) Sport?
The Pirelli P-Zero (PZ4) Sport in 285/40R21 is a summer 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.
What does 109W mean on the Pirelli P-Zero (PZ4) Sport?
109W breaks down as load index 109 — rated for 2,271 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
Keep shopping
Browse Pirelli tires, see every Pirelli P-Zero (PZ4) Sport size, or view all tires at ThreePiece.us.
- BRAND:
- Pirelli
- Model:
- P-Zero (PZ4) Sport
- Size:
- 285/40R21XL
- Aspect Ratio:
- 40
- Load Index:
- 109
- Load Range:
- Extra Load
- Section Width:
- 285
- Service Description:
- 109W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 29.96
- Tire Type:
- Summer
- Traction:
- AA
- Tread Wear:
- 280
- Tread Depth:
- 9
- UQTG:
- 280AAA
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