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Cooper Tires
Cooper Tires COO Discoverer AT3 XLT LT305/55R20/12
Cooper Tires COO Discoverer AT3 XLT LT305/55R20/12
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Cooper Tires
UPC:
00029142970279
Lease-to-own for as low as
/week
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Width:
12.20
(in)
Height:
33.35
(in)
Depth:
20.00
(in)
SKU:
170051002
|
$514.00
Lease-to-own for as low as
/week
Get Started
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Shop the Cooper Tires Discoverer AT3 XLT 305/55R20 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 305/55R20 means
In the size 305/55R20, 305 is the section width in millimeters (12.01 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 167.8 mm (6.60 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 33.21 inches, turning roughly 607 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 125 — a maximum load of 3,638 lbs per tire, or 122 (3,307 lbs) per tire when mounted as duals. The speed symbol S corresponds to a maximum sustained speed of 112 mph.
Load Range F corresponds to a 12-ply rating.
Specifications
| Size | LT305/55R20/12 |
| Tire Type | All Terrain |
| Service Description | 125/122S |
| Load Index | 125/122 |
| Speed Rating | S |
| Load Range | F |
| Section Width (mm) | 305 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 33.35 |
| Tread Depth (/32") | 16 |
| Warranty | 60K |
Frequently asked questions
What warranty does the Cooper Tires Discoverer AT3 XLT carry?
The manufacturer's warranty on this tire is 60K.
What does 125/122S mean on the Cooper Tires Discoverer AT3 XLT?
125/122S breaks down as load index 125 — rated for 3,638 lbs per tire (122, or 3,307 lbs, in dual fitment) — with an S speed rating, good for a maximum sustained 112 mph.
What kind of tire is the Cooper Tires Discoverer AT3 XLT?
The Cooper Tires Discoverer AT3 XLT in 305/55R20 is a all terrain tire.
Keep shopping
Shop all 305/55R20 tires, see every Cooper Tires Discoverer AT3 XLT size, explore all terrain tires, or view all tires at ThreePiece.us.
- BRAND:
- Cooper Tires
- Model:
- COO Discoverer AT3 XLT
- Size:
- LT305/55R20/12
- Aspect Ratio:
- 55
- Load Index:
- 125/122
- Load Range:
- F
- Section Width:
- 305
- Service Description:
- 125/122S
- Speed Index:
- S
- Temperature:
- N/A
- Tire Rim Diameter:
- 33.35
- Tire Type:
- All Terrain
- Traction:
- N/A
- Tread Wear:
- N/A
- Tread Depth:
- 16
- UQTG:
- N/A
- Warranty:
- 60K
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