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Ironman
Ironman All Country HT 4S 235/55R18 100H - 99023.1
Ironman All Country HT 4S 235/55R18 100H - 99023.1
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The Ironman All Country HT 4S in 235/55R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 235/55R18 means
In the size 235/55R18, 235 is the section width in millimeters (9.25 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 129.2 mm (5.09 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 28.18 inches, turning roughly 716 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 100 — a maximum load of 1,764 lbs per tire. The speed symbol H corresponds to a maximum sustained speed of 130 mph.
Specifications
| Size | 235/55R18 |
| Tire Type | All Season |
| Service Description | 100H |
| Load Index | 100 |
| Speed Rating | H |
| Load Range | Standard Load |
| Section Width (mm) | 235 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 28.15 |
| Tread Depth (/32") | 11 |
| Treadwear | 600 |
| Traction Grade | A |
| Temperature Grade | B |
| UTQG | 600AB |
| Warranty | 55K |
Frequently asked questions
What does 100H mean on the Ironman All Country HT 4S?
100H breaks down as load index 100 — rated for 1,764 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.
What kind of tire is the Ironman All Country HT 4S?
The Ironman All Country HT 4S in 235/55R18 is a all season tire.
What are the treadwear and warranty ratings on the Ironman All Country HT 4S?
This tire carries a treadwear grade of 600, traction grade A, temperature grade B under UTQG. The manufacturer's warranty is 55K.
Keep shopping
Shop all 235/55R18 tires, browse Ironman tires, see every Ironman All Country HT 4S size, or view all tires at ThreePiece.us.
- Brand:
- Ironman
- Model:
- All Country HT 4S
- Size:
- 235/55R18
- Aspect Ratio:
- 55
- Load Index:
- 100
- Load Range:
- Standard Load
- Section Width:
- 235
- Service Description:
- 100H
- Speed Index:
- H
- Temperature:
- B
- Tire Rim Diameter:
- 28.15
- Tire Type:
- All Season
- Traction:
- A
- Tread Wear:
- 600
- Tread Depth:
- 11
- UQTG:
- 600AB
- Warranty:
- 55K
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