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Cooper
Cooper Discoverer Road Trail AT 235/75R15 109T - 171270049
Cooper Discoverer Road Trail AT 235/75R15 109T - 171270049
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Shop the Cooper Discoverer Road Trail AT 235/75R15 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 235/75R15 means
In the size 235/75R15, 235 is the section width in millimeters (9.25 in), 75 is the aspect ratio — the sidewall stands 75% as tall as the tire is wide, or 176.2 mm (6.94 in) — R denotes radial construction, and 15 is the wheel diameter in inches. That works out to an overall diameter of about 28.88 inches, turning roughly 698 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 109 — a maximum load of 2,271 lbs per tire. The speed symbol T corresponds to a maximum sustained speed of 118 mph.
Load Range E corresponds to a 10-ply rating.
Specifications
| Size | 235/75R15 |
| Tire Type | All Season |
| Service Description | 109T |
| Load Index | 109 |
| Speed Rating | T |
| Load Range | Extra Load |
| Section Width (mm) | 235 |
| Aspect Ratio | 75 |
| Overall Diameter (in) | 28.86 |
| Tread Depth (/32") | 13 |
| Treadwear | 620 |
| Traction Grade | A |
| Temperature Grade | B |
| UTQG | 620AB |
| Warranty | 65K |
Frequently asked questions
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 109T mean on the Cooper Discoverer Road Trail AT?
109T breaks down as load index 109 — rated for 2,271 lbs per tire — with a T speed rating, good for a maximum sustained 118 mph.
What kind of tire is the Cooper Discoverer Road Trail AT?
The Cooper Discoverer Road Trail AT in 235/75R15 is a all season tire.
Keep shopping
Shop all 235/75R15 tires, 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:
- 235/75R15
- Aspect Ratio:
- 75
- Load Index:
- 109
- Load Range:
- Extra Load
- Section Width:
- 235
- Service Description:
- 109T
- Speed Index:
- T
- Temperature:
- B
- Tire Rim Diameter:
- 28.86
- Tire Type:
- All Season
- Traction:
- A
- Tread Wear:
- 620
- Tread Depth:
- 13
- UQTG:
- 620AB
- Warranty:
- 65K
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