Ironman STR ST235/85R16/14 129/125N - 98938

The Ironman STR in 235/85R16 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 235/85R16 means

In the size 235/85R16, 235 is the section width in millimeters (9.25 in), 85 is the aspect ratio — the sidewall stands 85% as tall as the tire is wide, or 199.8 mm (7.86 in) — R denotes radial construction, and 16 is the wheel diameter in inches. That works out to an overall diameter of about 31.73 inches, turning roughly 636 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 129 — a maximum load of 4,079 lbs per tire, or 125 (3,638 lbs) per tire when mounted as duals. The speed symbol N corresponds to a maximum sustained speed of 87 mph.

Load Range G corresponds to a 14-ply rating.

Specifications

Frequently asked questions

What does 129/125N mean on the Ironman STR?

129/125N breaks down as load index 129 — rated for 4,079 lbs per tire (125, or 3,638 lbs, in dual fitment) — with an N speed rating, good for a maximum sustained 87 mph.

Will 235/85R16 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 235/85R16, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 235/85R16 tire in stock to compare options.

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.

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