American Roadstar Pro AS 225/60R18

The American Roadstar Pro AS in 225/60R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 225/60R18 means

In the size 225/60R18, 225 is the section width in millimeters (8.86 in), 60 is the aspect ratio — the sidewall stands 60% as tall as the tire is wide, or 135.0 mm (5.31 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 28.63 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 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 V corresponds to a maximum sustained speed of 149 mph.

Specifications

Frequently asked questions

What does 104V mean on the American Roadstar Pro AS?

104V breaks down as load index 104 — rated for 1,984 lbs per tire — with a V speed rating, good for a maximum sustained 149 mph.

What are the treadwear and warranty ratings on the American Roadstar Pro AS?

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

Will 225/60R18 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 225/60R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 225/60R18 tire in stock to compare options.

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