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Cooper Tires
Cooper Tires COO Discoverer AT3 4S 255/70R18
Cooper Tires COO Discoverer AT3 4S 255/70R18
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Cooper Tires
UPC:
00029142969396
Lease-to-own for as low as
/week
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Width:
10.20
(in)
Height:
32.13
(in)
Depth:
18.00
(in)
SKU:
171043002
|
$304.00
Lease-to-own for as low as
/week
Get Started
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Looking for a 255/70R18 all terrain tire? The Cooper Tires Discoverer AT3 4S is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 255/70R18 means
In the size 255/70R18, 255 is the section width in millimeters (10.04 in), 70 is the aspect ratio — the sidewall stands 70% as tall as the tire is wide, or 178.5 mm (7.03 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 32.06 inches, turning roughly 629 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 113 — a maximum load of 2,535 lbs per tire. The speed symbol T corresponds to a maximum sustained speed of 118 mph.
Specifications
| Size | 255/70R18 |
| Tire Type | All Terrain |
| Service Description | 113T |
| Load Index | 113 |
| Speed Rating | T |
| Load Range | SL |
| Section Width (mm) | 255 |
| Aspect Ratio | 70 |
| Overall Diameter (in) | 32.13 |
| Tread Depth (/32") | 14 |
| Treadwear | 620 |
| Traction Grade | A |
| Temperature Grade | B |
| UTQG | 620AB |
| Warranty | 65K |
Frequently asked questions
What kind of tire is the Cooper Tires Discoverer AT3 4S?
The Cooper Tires Discoverer AT3 4S in 255/70R18 is a all terrain tire.
What are the treadwear and warranty ratings on the Cooper Tires Discoverer AT3 4S?
This tire carries a treadwear grade of 620, traction grade A, temperature grade B under UTQG. The manufacturer's warranty is 65K.
What does 113T mean on the Cooper Tires Discoverer AT3 4S?
113T breaks down as load index 113 — rated for 2,535 lbs per tire — with a T speed rating, good for a maximum sustained 118 mph.
Keep shopping
Shop all 255/70R18 tires, see every Cooper Tires Discoverer AT3 4S size, explore all terrain tires, or view all tires at ThreePiece.us.
- BRAND:
- Cooper Tires
- Model:
- COO Discoverer AT3 4S
- Size:
- 255/70R18
- Aspect Ratio:
- 70
- Load Index:
- 113
- Load Range:
- SL
- Section Width:
- 255
- Service Description:
- 113T
- Speed Index:
- T
- Temperature:
- B
- Tire Rim Diameter:
- 32.13
- Tire Type:
- All Terrain
- Traction:
- A
- Tread Wear:
- 620
- Tread Depth:
- 14
- UQTG:
- 620AB
- Warranty:
- 65K
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