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Pirelli
Pirelli PZero R 345/25R21XL 104(Y) - 4682400
Pirelli PZero R 345/25R21XL 104(Y) - 4682400
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The Pirelli PZero R in 345/25R21 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 345/25R21 means
In the size 345/25R21, 345 is the section width in millimeters (13.58 in), 25 is the aspect ratio — the sidewall stands 25% as tall as the tire is wide, or 86.2 mm (3.40 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 27.79 inches, turning roughly 726 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 104 — a maximum load of 1,984 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.
Load Range E corresponds to a 10-ply rating.
Specifications
| Size | 345/25R21XL |
| Tire Type | Summer |
| Service Description | 104Y |
| Load Index | 104 |
| Speed Rating | Y |
| Load Range | Extra Load |
| Section Width (mm) | 345 |
| Aspect Ratio | 25 |
| Overall Diameter (in) | 27.76 |
| Tread Depth (/32") | 9 |
| Treadwear | 280 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 280AAA |
Frequently asked questions
What does 104Y mean on the Pirelli PZero R?
104Y breaks down as load index 104 — rated for 1,984 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.
What kind of tire is the Pirelli PZero R?
The Pirelli PZero R in 345/25R21 is a summer tire.
What are the treadwear and warranty ratings on the Pirelli PZero R?
This tire carries a treadwear grade of 280, traction grade AA, temperature grade A under UTQG.
Keep shopping
Browse Pirelli tires, see every Pirelli PZero R size, or view all tires at ThreePiece.us.
- BRAND:
- Pirelli
- Model:
- PZero R
- Size:
- 345/25R21XL
- Aspect Ratio:
- 25
- Load Index:
- 104
- Load Range:
- Extra Load
- Section Width:
- 345
- Service Description:
- 104Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 27.76
- Tire Type:
- Summer
- Traction:
- AA
- Tread Wear:
- 280
- Tread Depth:
- 9
- UQTG:
- 280AAA
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