Firestone Duraforce DT 390/60D15/8 - 360465

The Firestone Duraforce DT in 390/60R15 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 390/60R15 means

In the size 390/60R15, 390 is the section width in millimeters (15.35 in), 60 is the aspect ratio — the sidewall stands 60% as tall as the tire is wide, or 234.0 mm (9.21 in) — R denotes radial construction, and 15 is the wheel diameter in inches. That works out to an overall diameter of about 33.43 inches, turning roughly 603 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 31.2 inches — when clearance is tight, go by the published figure rather than the nominal size math.

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.

Will 390/60R15 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 390/60R15, 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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