Write a Review
Ironman
Ironman IRON All Country HT 235/55R18
Ironman IRON All Country HT 235/55R18
📧 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 235/55R18 highway tire? The Ironman All Country HT is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
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 | Highway |
| Service Description | 100H |
| Load Index | 100 |
| Speed Rating | H |
| Load Range | SL |
| Section Width (mm) | 235 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 28.27 |
| Tread Depth (/32") | 10.5 |
| Treadwear | 500 |
| Traction Grade | A |
| Temperature Grade | B |
| UTQG | 500AB |
Frequently asked questions
What kind of tire is the Ironman All Country HT?
The Ironman All Country HT in 235/55R18 is a highway tire.
What are the treadwear and warranty ratings on the Ironman All Country HT?
This tire carries a treadwear grade of 500, traction grade A, temperature grade B under UTQG.
What does 100H mean on the Ironman All Country HT?
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.
Keep shopping
Shop all 235/55R18 tires, see every Ironman All Country HT size, or view all tires at ThreePiece.us.
- BRAND:
- Ironman
- Model:
- IRON All Country HT
- Size:
- 235/55R18
- Aspect Ratio:
- 55
- Load Index:
- 100
- Load Range:
- SL
- Section Width:
- 235
- Service Description:
- 100H
- Speed Index:
- H
- Temperature:
- B
- Tire Rim Diameter:
- 28.27
- Tire Type:
- Highway
- Traction:
- A
- Tread Wear:
- 500
- Tread Depth:
- 10.5
- UQTG:
- 500AB
- Warranty:
- N/A
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