Firestone Duraforce SDT 355/70D17.5/14 - 365741

The Firestone Duraforce SDT in 355/70R17.5 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 355/70R17.5 means

In the size 355/70R17.5, 355 is the section width in millimeters (13.98 in), 70 is the aspect ratio — the sidewall stands 70% as tall as the tire is wide, or 248.5 mm (9.78 in) — R denotes radial construction, and 17.5 is the wheel diameter in inches. That works out to an overall diameter of about 37.07 inches, turning roughly 544 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 36.25 inches — when clearance is tight, go by the published figure rather than the nominal size math.

Specifications

Frequently asked questions

Will 355/70R17.5 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 355/70R17.5, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.

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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