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Pirelli
Pirelli PIR P-Zero (PZ4) 245/40ZR18XL
Pirelli PIR P-Zero (PZ4) 245/40ZR18XL
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Shop the Pirelli P-Zero (PZ4) 245/40R18 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 245/40R18 means
In the size 245/40R18, 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 18 is the wheel diameter in inches. That works out to an overall diameter of about 25.72 inches, turning roughly 784 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 18 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 97 — a maximum load of 1,609 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.
Specifications
| Size | 245/40ZR18xL |
| Tire Type | High-Performance |
| Service Description | 97Y |
| Load Index | 97 |
| Speed Rating | Y |
| Load Range | XL |
| Section Width (mm) | 245 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 18 |
| Tread Depth (/32") | 9 |
| Treadwear | 300 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 300AAA |
Frequently asked questions
What are the treadwear and warranty ratings on the Pirelli P-Zero (PZ4)?
This tire carries a treadwear grade of 300, traction grade AA, temperature grade A under UTQG.
What does 97Y mean on the Pirelli P-Zero (PZ4)?
97Y breaks down as load index 97 — rated for 1,609 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)?
The Pirelli P-Zero (PZ4) in 245/40R18 is a high-performance tire.
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Shop all 245/40R18 tires, see every Pirelli P-Zero (PZ4) size, or view all tires at ThreePiece.us.
- BRAND:
- Pirelli
- Model:
- PIR P-Zero (PZ4)
- Size:
- 245/40ZR18xL
- Aspect Ratio:
- 40
- Load Index:
- 97
- Load Range:
- XL
- Section Width:
- 245
- Service Description:
- 97Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 18
- Tire Type:
- High-Performance
- Traction:
- AA
- Tread Wear:
- 300
- Tread Depth:
- 9
- UQTG:
- 300AAA
- Warranty:
- N/A
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