Write a Review
Pirelli
Pirelli P-Zero (PZ4) Sport 255/45R21XL 106W - 3805800
Pirelli P-Zero (PZ4) Sport 255/45R21XL 106W - 3805800
📧 Get Fitment Help
Verify parts fit & get product recommendations
Lease-to-own for as low as
/week
Get Started
Guaranteed to Fit — confirm your size with the fitment checker on this page
Price Match Guarantee Learn More
Free Mount & Balance
Free Shipping
OUT OF STOCK 
📧 Get Fitment Help
Verify parts fit & get product recommendations
Looking for a 255/45R21 summer tire? The Pirelli P-Zero (PZ4) Sport is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 255/45R21 means
In the size 255/45R21, 255 is the section width in millimeters (10.04 in), 45 is the aspect ratio — the sidewall stands 45% as tall as the tire is wide, or 114.8 mm (4.52 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 30.04 inches, turning roughly 671 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 106 — a maximum load of 2,094 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 | 255/45R21XL |
| Tire Type | Summer |
| Service Description | 106W |
| Load Index | 106 |
| Speed Rating | W |
| Load Range | Extra Load |
| Section Width (mm) | 255 |
| Aspect Ratio | 45 |
| Overall Diameter (in) | 30.04 |
| Tread Depth (/32") | 8 |
| Treadwear | 280 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 280AAA |
Frequently asked questions
What kind of tire is the Pirelli P-Zero (PZ4) Sport?
The Pirelli P-Zero (PZ4) Sport in 255/45R21 is a summer tire.
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 106W mean on the Pirelli P-Zero (PZ4) Sport?
106W breaks down as load index 106 — rated for 2,094 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
Keep shopping
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:
- 255/45R21XL
- Aspect Ratio:
- 45
- Load Index:
- 106
- Load Range:
- Extra Load
- Section Width:
- 255
- Service Description:
- 106W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 30.04
- Tire Type:
- Summer
- Traction:
- AA
- Tread Wear:
- 280
- Tread Depth:
- 8
- UQTG:
- 280AAA
PRODUCT REVIEWS (0)
Overall Rankings
Have you tried this product?
WRITE A REVIEWNo reviews for this product yet. Be the first to write a review!
Write a Review