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Hercules
Hercules HER Avalanche RT 225/55R18
Hercules HER Avalanche RT 225/55R18
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Shop the Hercules Avalanche RT 225/55R18 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 225/55R18 means
In the size 225/55R18, 225 is the section width in millimeters (8.86 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 123.8 mm (4.87 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 27.74 inches, turning roughly 727 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 98 — a maximum load of 1,653 lbs per tire. The speed symbol T corresponds to a maximum sustained speed of 118 mph.
Specifications
| Size | 225/55R18 |
| Tire Type | Touring |
| Service Description | 98T |
| Load Index | 98 |
| Speed Rating | T |
| Load Range | SL |
| Section Width (mm) | 225 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 27.76 |
| Tread Depth (/32") | 12 |
Frequently asked questions
Will 225/55R18 tires fit my vehicle?
Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 225/55R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 225/55R18 tire in stock to compare options.
What does 98T mean on the Hercules Avalanche RT?
98T breaks down as load index 98 — rated for 1,653 lbs per tire — with a T speed rating, good for a maximum sustained 118 mph.
What kind of tire is the Hercules Avalanche RT?
The Hercules Avalanche RT in 225/55R18 is a touring tire.
Keep shopping
Shop all 225/55R18 tires, see every Hercules Avalanche RT size, or view all tires at ThreePiece.us.
- BRAND:
- Hercules
- Model:
- HER Avalanche RT
- Size:
- 225/55R18
- Aspect Ratio:
- 55
- Load Index:
- 98
- Load Range:
- SL
- Section Width:
- 225
- Service Description:
- 98T
- Speed Index:
- T
- Temperature:
- N/A
- Tire Rim Diameter:
- 27.76
- Tire Type:
- Touring
- Traction:
- N/A
- Tread Wear:
- N/A
- Tread Depth:
- 12
- UQTG:
- N/A
- Warranty:
- N/A
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