Mastercraft MSC Courser CXT LT275/65R18/10

Looking for a 275/65R18 all terrain tire? The Mastercraft Courser CXT is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.

What 275/65R18 means

In the size 275/65R18, 275 is the section width in millimeters (10.83 in), 65 is the aspect ratio — the sidewall stands 65% as tall as the tire is wide, or 178.8 mm (7.04 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 32.07 inches, turning roughly 629 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 120 — a maximum load of 3,086 lbs per tire. The speed symbol Q corresponds to a maximum sustained speed of 99 mph.

Load Range E corresponds to a 10-ply rating.

Specifications

Frequently asked questions

What kind of tire is the Mastercraft Courser CXT?

The Mastercraft Courser CXT in 275/65R18 is a all terrain tire.

Will 275/65R18 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 275/65R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 275/65R18 tire in stock to compare options.

What does 120Q mean on the Mastercraft Courser CXT?

120Q breaks down as load index 120 — rated for 3,086 lbs per tire — with a Q speed rating, good for a maximum sustained 99 mph.

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