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Toyo
Toyo TOY Extensa HP II 255/45R18XL
Toyo TOY Extensa HP II 255/45R18XL
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The Toyo Extensa HP II in 255/45R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 255/45R18 means
In the size 255/45R18, 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 18 is the wheel diameter in inches. That works out to an overall diameter of about 27.04 inches, turning roughly 746 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 103 — a maximum load of 1,929 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Specifications
| Size | 255/45R18xL |
| Tire Type | High-Performance |
| Service Description | 103W |
| Load Index | 103 |
| Speed Rating | W |
| Load Range | XL |
| Section Width (mm) | 255 |
| Aspect Ratio | 45 |
| Overall Diameter (in) | 18 |
| Tread Depth (/32") | 9.7 |
| Treadwear | 500 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 500AA |
| Warranty | 45K |
Frequently asked questions
What does 103W mean on the Toyo Extensa HP II?
103W breaks down as load index 103 — rated for 1,929 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
What kind of tire is the Toyo Extensa HP II?
The Toyo Extensa HP II in 255/45R18 is a high-performance tire.
What are the treadwear and warranty ratings on the Toyo Extensa HP II?
This tire carries a treadwear grade of 500, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 45K.
Keep shopping
See every Toyo Extensa HP II size, or view all tires at ThreePiece.us.
- Brand:
- Toyo
- Model:
- TOY Extensa HP II
- Size:
- 255/45R18xL
- Aspect Ratio:
- 45
- Load Index:
- 103
- Load Range:
- XL
- Section Width:
- 255
- Service Description:
- 103W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 18
- Tire Type:
- High-Performance
- Traction:
- A
- Tread Wear:
- 500
- Tread Depth:
- 9.7
- UQTG:
- 500AA
- Warranty:
- 45K
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