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Pirelli
Pirelli PIR P-Zero (PZ4) 245/40R21XL 100W
Pirelli PIR P-Zero (PZ4) 245/40R21XL 100W
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Shop the Pirelli P-Zero (PZ4) 245/40R21 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 245/40R21 means
In the size 245/40R21, 245 is the section width in millimeters (9.65 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 98.0 mm (3.86 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 28.72 inches, turning roughly 702 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 100 — a maximum load of 1,764 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Specifications
| Size | 245/40R21xL |
| Tire Type | High-Performance |
| Service Description | 100W |
| Load Index | 100 |
| Speed Rating | W |
| Load Range | XL |
| Section Width (mm) | 245 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 21 |
| Tread Depth (/32") | 8 |
| Treadwear | 220 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 220AAA |
Frequently asked questions
What are the treadwear and warranty ratings on the Pirelli P-Zero (PZ4)?
This tire carries a treadwear grade of 220, traction grade AA, temperature grade A under UTQG.
What does 100W mean on the Pirelli P-Zero (PZ4)?
100W breaks down as load index 100 — rated for 1,764 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
What kind of tire is the Pirelli P-Zero (PZ4)?
The Pirelli P-Zero (PZ4) in 245/40R21 is a high-performance tire.
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See every Pirelli P-Zero (PZ4) size, or view all tires at ThreePiece.us.
- BRAND:
- Pirelli
- Model:
- PIR P-Zero (PZ4)
- Size:
- 245/40R21xL
- Aspect Ratio:
- 40
- Load Index:
- 100
- Load Range:
- XL
- Section Width:
- 245
- Service Description:
- 100W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 21
- Tire Type:
- High-Performance
- Traction:
- AA
- Tread Wear:
- 220
- Tread Depth:
- 8
- UQTG:
- 220AAA
- Warranty:
- N/A
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