AMP Terrain Attack A/T A LT305/60R18

The AMP Terrain Attack A/T A in 305/60R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 305/60R18 means

In the size 305/60R18, 305 is the section width in millimeters (12.01 in), 60 is the aspect ratio — the sidewall stands 60% as tall as the tire is wide, or 183.0 mm (7.20 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 32.41 inches, turning roughly 622 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 service description on this tire decodes to a load index of 121 — a maximum load of 3,197 lbs per tire, or 118 (2,910 lbs) per tire when mounted as duals. The speed symbol R corresponds to a maximum sustained speed of 106 mph.

Load Range E corresponds to a 10-ply rating.

Specifications

Frequently asked questions

What does 121/118R mean on the AMP Terrain Attack A/T A?

121/118R breaks down as load index 121 — rated for 3,197 lbs per tire (118, or 2,910 lbs, in dual fitment) — with an R speed rating, good for a maximum sustained 106 mph.

What kind of tire is the AMP Terrain Attack A/T A?

The AMP Terrain Attack A/T A in 305/60R18 is a all terrain tire.

Will 305/60R18 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 305/60R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.

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