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Pirelli
Pirelli P-Zero (PZ4) Sport 255/40R21 102W - 3839600
Pirelli P-Zero (PZ4) Sport 255/40R21 102W - 3839600
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Shop the Pirelli P-Zero (PZ4) Sport 255/40R21 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 255/40R21 means
In the size 255/40R21, 255 is the section width in millimeters (10.04 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 102.0 mm (4.02 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 29.03 inches, turning roughly 695 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 102 — a maximum load of 1,874 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 | 255/40R21 |
| Tire Type | Summer |
| Service Description | 102W |
| Load Index | 102 |
| Speed Rating | W |
| Load Range | Extra Load |
| Section Width (mm) | 255 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 29.02 |
| Tread Depth (/32") | 10 |
| Treadwear | 280 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 280AAA |
Frequently asked questions
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 102W mean on the Pirelli P-Zero (PZ4) Sport?
102W breaks down as load index 102 — rated for 1,874 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) Sport?
The Pirelli P-Zero (PZ4) Sport in 255/40R21 is a summer tire.
Keep shopping
Shop all 255/40R21 tires, 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:
- 255/40R21
- Aspect Ratio:
- 40
- Load Index:
- 102
- Load Range:
- Extra Load
- Section Width:
- 255
- Service Description:
- 102W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 29.02
- Tire Type:
- Summer
- Traction:
- AA
- Tread Wear:
- 280
- Tread Depth:
- 10
- UQTG:
- 280AAA
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