Firestone Maxi Traction 420/90R30 159D - 006323

Shop the Firestone Maxi Traction 420/90R30 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.

What 420/90R30 means

In the size 420/90R30, 420 is the section width in millimeters (16.54 in), 90 is the aspect ratio — the sidewall stands 90% as tall as the tire is wide, or 378.0 mm (14.88 in) — R denotes radial construction, and 30 is the wheel diameter in inches. That works out to an overall diameter of about 59.76 inches, turning roughly 337 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 59.3 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 159 — a maximum load of 9,645 lbs per tire.

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 159D mean on the Firestone Maxi Traction?

159D breaks down as load index 159 — rated for 9,645 lbs per tire.

Will 420/90R30 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 420/90R30, 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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