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American Roadstar
American Roadstar Sport AS 275/40R20
American Roadstar Sport AS 275/40R20
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Looking for a 275/40R20 tire? The American Roadstar Sport AS is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 275/40R20 means
In the size 275/40R20, 275 is the section width in millimeters (10.83 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 110.0 mm (4.33 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 28.66 inches, turning roughly 704 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 20 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 106 — a maximum load of 2,094 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Specifications
| Size | 275/40R20 |
| Service Description | 106W |
| Load Index | 106 |
| Speed Rating | W |
| Section Width (mm) | 275 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 20 |
| Treadwear | 500 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 500 A A |
Frequently asked questions
What are the treadwear and warranty ratings on the American Roadstar Sport AS?
This tire carries a treadwear grade of 500, traction grade A, temperature grade A under UTQG.
Will 275/40R20 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 275/40R20, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 275/40R20 tire in stock to compare options.
What does 106W mean on the American Roadstar Sport AS?
106W breaks down as load index 106 — rated for 2,094 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
Keep shopping
Shop all 275/40R20 tires, see every American Roadstar Sport AS size, or view all tires at ThreePiece.us.
- BRAND:
- American Roadstar
- Model:
- Sport AS
- Size:
- 275/40R20
- Aspect Ratio:
- 40
- Load Index:
- 106
- Load Range:
- N/A
- Section Width:
- 275
- Service Description:
- 106W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 20
- Tire Type:
- N/A
- Traction:
- A
- Tread Wear:
- 500
- Max Load (LB):
- 2094.36
- UQTG:
- 500 A A
- Side Wall:
- N/A
- Warranty:
- N/A
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