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American Roadstar
American Roadstar HT 235/55R18
American Roadstar HT 235/55R18
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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 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 104 — a maximum load of 1,984 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Specifications
| Size | 235/55R18 |
| Service Description | 104W |
| Load Index | 104 |
| Speed Rating | W |
| Section Width (mm) | 235 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 18 |
| Treadwear | 600 |
| Traction Grade | A |
| Temperature Grade | B |
| UTQG | 600 A B |
Frequently asked questions
Will 235/55R18 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 235/55R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 235/55R18 tire in stock to compare options.
What does 104W mean on the American Roadstar HT?
104W breaks down as load index 104 — rated for 1,984 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
What are the treadwear and warranty ratings on the American Roadstar HT?
This tire carries a treadwear grade of 600, traction grade A, temperature grade B under UTQG.
Keep shopping
Shop all 235/55R18 tires, see every American Roadstar HT size, or view all tires at ThreePiece.us.
- BRAND:
- American Roadstar
- Model:
- HT
- Size:
- 235/55R18
- Aspect Ratio:
- 55
- Load Index:
- 104
- Load Range:
- N/A
- Section Width:
- 235
- Service Description:
- 104W
- Speed Index:
- W
- Temperature:
- B
- Tire Rim Diameter:
- 18
- Tire Type:
- N/A
- Traction:
- A
- Tread Wear:
- 600
- Max Load (LB):
- 1984.13
- UQTG:
- 600 A B
- Side Wall:
- N/A
- Warranty:
- N/A
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