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Hercules
Hercules Raptis R-T5 255/40ZR18XL 99W - 94664
Hercules Raptis R-T5 255/40ZR18XL 99W - 94664
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The Hercules Raptis R-T5 in 255/40R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 255/40R18 means
In the size 255/40R18, 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 18 is the wheel diameter in inches. That works out to an overall diameter of about 26.03 inches, turning roughly 775 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 99 — a maximum load of 1,709 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Specifications
| Size | 255/40ZR18XL |
| Tire Type | All Season |
| Service Description | 99W |
| Load Index | 99 |
| Speed Rating | W |
| Load Range | XL |
| Section Width (mm) | 255 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 26 |
| Tread Depth (/32") | 9.5 |
| Treadwear | 500 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 500AAA |
| Warranty | 45K |
Frequently asked questions
What does 99W mean on the Hercules Raptis R-T5?
99W breaks down as load index 99 — rated for 1,709 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
What kind of tire is the Hercules Raptis R-T5?
The Hercules Raptis R-T5 in 255/40R18 is a all season tire.
What are the treadwear and warranty ratings on the Hercules Raptis R-T5?
This tire carries a treadwear grade of 500, traction grade AA, temperature grade A under UTQG. The manufacturer's warranty is 45K.
Keep shopping
Shop all 255/40R18 tires, browse Hercules tires, see every Hercules Raptis R-T5 size, or view all tires at ThreePiece.us.
- BRAND:
- Hercules
- Model:
- Raptis R-T5
- Size:
- 255/40ZR18XL
- Aspect Ratio:
- 40
- Load Index:
- 99
- Load Range:
- XL
- Section Width:
- 255
- Service Description:
- 99W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 26
- Tire Type:
- All Season
- Traction:
- AA
- Tread Wear:
- 500
- Tread Depth:
- 9.5
- UQTG:
- 500AAA
- Warranty:
- 45K
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