Mastercraft MSC Stratus AP 275/55R20XL

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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.

The manufacturer lists the overall diameter of this specific tire as 20 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 117 — a maximum load of 2,833 lbs per tire. The speed symbol H corresponds to a maximum sustained speed of 130 mph.

Specifications

Frequently asked questions

What are the treadwear and warranty ratings on the Mastercraft Stratus AP?

This tire carries a treadwear grade of 500, traction grade A, temperature grade B under UTQG. The manufacturer's warranty is 50K.

What does 117H mean on the Mastercraft Stratus AP?

117H breaks down as load index 117 — rated for 2,833 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.

What kind of tire is the Mastercraft Stratus AP?

The Mastercraft Stratus AP in 275/55R20 is a highway tire.

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