Ironman STR ST175/80R13/6 91/87N - 98932

Shop the Ironman STR 175/80R13 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.

What 175/80R13 means

In the size 175/80R13, 175 is the section width in millimeters (6.89 in), 80 is the aspect ratio — the sidewall stands 80% as tall as the tire is wide, or 140.0 mm (5.51 in) — R denotes radial construction, and 13 is the wheel diameter in inches. That works out to an overall diameter of about 24.02 inches, turning roughly 840 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 91 — a maximum load of 1,356 lbs per tire, or 87 (1,202 lbs) per tire when mounted as duals. The speed symbol N corresponds to a maximum sustained speed of 87 mph.

Load Range C corresponds to a 6-ply rating.

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 does 91/87N mean on the Ironman STR?

91/87N breaks down as load index 91 — rated for 1,356 lbs per tire (87, or 1,202 lbs, in dual fitment) — with an N speed rating, good for a maximum sustained 87 mph.

Will 175/80R13 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 175/80R13, 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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