American Roadstar Sport AS 255/35R18

The American Roadstar Sport AS in 255/35R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 255/35R18 means

In the size 255/35R18, 255 is the section width in millimeters (10.04 in), 35 is the aspect ratio — the sidewall stands 35% as tall as the tire is wide, or 89.2 mm (3.51 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 25.03 inches, turning roughly 806 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 94 — a maximum load of 1,477 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.

Specifications

Frequently asked questions

What does 94W mean on the American Roadstar Sport AS?

94W breaks down as load index 94 — rated for 1,477 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 Sport AS?

This tire carries a treadwear grade of 500, traction grade A, temperature grade A under UTQG.

Will 255/35R18 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 255/35R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 255/35R18 tire in stock to compare options.

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