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Firestone
Firestone Duraforce UT 405/70R18 153A2 - 003997
Firestone Duraforce UT 405/70R18 153A2 - 003997
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Shop the Firestone Duraforce UT 405/70R18 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 405/70R18 means
In the size 405/70R18, 405 is the section width in millimeters (15.94 in), 70 is the aspect ratio — the sidewall stands 70% as tall as the tire is wide, or 283.5 mm (11.16 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 40.32 inches, turning roughly 500 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 40.7 inches — when clearance is tight, go by the published figure rather than the nominal size math.
Specifications
| Size | 405/70R18 |
| Service Description | 153A2 |
| Load Index | 153 |
| Speed Rating | A2 |
| Section Width (mm) | 405 |
| Aspect Ratio | 70 |
| Overall Diameter (in) | 40.7 |
| Tread Depth (/32") | 32 |
Frequently asked questions
Will 405/70R18 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 405/70R18, 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.
Keep shopping
Browse Firestone tires, see every Firestone Duraforce UT size, or view all tires at ThreePiece.us.
- BRAND:
- Firestone
- Model:
- Duraforce UT
- Size:
- 405/70R18
- Aspect Ratio:
- 70
- Load Index:
- 153
- Section Width:
- 405
- Service Description:
- 153A2
- Speed Index:
- A2
- Tire Rim Diameter:
- 40.7
- Tread Depth:
- 32
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