Firestone Maxi Traction 420/90R30 145D - 011863

The Firestone Maxi Traction in 420/90R30 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

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 service description on this tire decodes to a load index of 145 — a maximum load of 6,393 lbs per tire.

Specifications

Frequently asked questions

What does 145D mean on the Firestone Maxi Traction?

145D breaks down as load index 145 — rated for 6,393 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.

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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