Cooper Discoverer AT3 4S 275/55R20XL - 171106010

Shop the Cooper Discoverer AT3 4S 275/55R20 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.

What 275/55R20 means

In the size 275/55R20, 275 is the section width in millimeters (10.83 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 151.2 mm (5.95 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 31.91 inches, turning roughly 632 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.

Specifications

Frequently asked questions

How fast does this tire ship?

Every order at ThreePiece.us ships free, with fast delivery from a nationwide warehouse network. Affirm financing is available at checkout.

What kind of tire is the Cooper Discoverer AT3 4S?

The Cooper Discoverer AT3 4S in 275/55R20 is a all season tire.

Will 275/55R20 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 275/55R20, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 275/55R20 tire in stock to compare options.

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