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Pirelli
Pirelli PIR P-Zero (PZ4) Sport 315/35R21 XL
Pirelli PIR P-Zero (PZ4) Sport 315/35R21 XL
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The Pirelli P-Zero (PZ4) Sport in 315/35R21 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 315/35R21 means
In the size 315/35R21, 315 is the section width in millimeters (12.40 in), 35 is the aspect ratio — the sidewall stands 35% as tall as the tire is wide, or 110.2 mm (4.34 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 29.68 inches, turning roughly 679 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 21 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 111 — a maximum load of 2,403 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.
Specifications
| Size | 315/35R21xL |
| Tire Type | High Performance |
| Service Description | 111Y |
| Load Index | 111 |
| Speed Rating | Y |
| Load Range | XL |
| Section Width (mm) | 315 |
| Aspect Ratio | 35 |
| Overall Diameter (in) | 21 |
| Tread Depth (/32") | 8 |
| Treadwear | 300 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 300AAA |
Frequently asked questions
What does 111Y mean on the Pirelli P-Zero (PZ4) Sport?
111Y breaks down as load index 111 — rated for 2,403 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 315/35R21 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 300, 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:
- 315/35R21xL
- Aspect Ratio:
- 35
- Load Index:
- 111
- Load Range:
- XL
- Section Width:
- 315
- Service Description:
- 111Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 21
- Tire Type:
- High Performance
- Traction:
- AA
- Tread Wear:
- 300
- Tread Depth:
- 8
- UQTG:
- 300AAA
- Warranty:
- N/A
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