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Cooper
Cooper Discoverer Road Trail AT 255/75R17 115T - 171284050
Cooper Discoverer Road Trail AT 255/75R17 115T - 171284050
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Looking for a 255/75R17 all season tire? The Cooper Discoverer Road Trail AT is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 255/75R17 means
In the size 255/75R17, 255 is the section width in millimeters (10.04 in), 75 is the aspect ratio — the sidewall stands 75% as tall as the tire is wide, or 191.2 mm (7.53 in) — R denotes radial construction, and 17 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 115 — a maximum load of 2,679 lbs per tire. The speed symbol T corresponds to a maximum sustained speed of 118 mph.
Specifications
| Size | 255/75R17 |
| Tire Type | All Season |
| Service Description | 115T |
| Load Index | 115 |
| Speed Rating | T |
| Section Width (mm) | 255 |
| Aspect Ratio | 75 |
| Overall Diameter (in) | 32.05 |
| Tread Depth (/32") | 13 |
| Treadwear | 620 |
| Traction Grade | A |
| Temperature Grade | B |
| UTQG | 620AB |
| Warranty | 65K |
Frequently asked questions
What kind of tire is the Cooper Discoverer Road Trail AT?
The Cooper Discoverer Road Trail AT in 255/75R17 is a all season tire.
What are the treadwear and warranty ratings on the Cooper Discoverer Road Trail AT?
This tire carries a treadwear grade of 620, traction grade A, temperature grade B under UTQG. The manufacturer's warranty is 65K.
What does 115T mean on the Cooper Discoverer Road Trail AT?
115T breaks down as load index 115 — rated for 2,679 lbs per tire — with a T speed rating, good for a maximum sustained 118 mph.
Keep shopping
Browse Cooper tires, see every Cooper Discoverer Road Trail AT size, or view all tires at ThreePiece.us.
- BRAND:
- Cooper
- Model:
- Discoverer Road Trail AT
- Size:
- 255/75R17
- Aspect Ratio:
- 75
- Load Index:
- 115
- Section Width:
- 255
- Service Description:
- 115T
- Speed Index:
- T
- Temperature:
- B
- Tire Rim Diameter:
- 32.05
- Tire Type:
- All Season
- Traction:
- A
- Tread Wear:
- 620
- Tread Depth:
- 13
- UQTG:
- 620AB
- Warranty:
- 65K
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