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Cooper
Cooper Discoverer STT Pro LT265/75R16/10 123/120Q - 170106034
Cooper Discoverer STT Pro LT265/75R16/10 123/120Q - 170106034
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The Cooper Discoverer STT Pro in 265/75R16 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 265/75R16 means
In the size 265/75R16, 265 is the section width in millimeters (10.43 in), 75 is the aspect ratio — the sidewall stands 75% as tall as the tire is wide, or 198.8 mm (7.82 in) — R denotes radial construction, and 16 is the wheel diameter in inches. That works out to an overall diameter of about 31.65 inches, turning roughly 637 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 31.89 inches — when clearance is tight, go by the published figure rather than the nominal size math.
The service description on this tire decodes to a load index of 123 — a maximum load of 3,417 lbs per tire, or 120 (3,086 lbs) per tire when mounted as duals. The speed symbol Q corresponds to a maximum sustained speed of 99 mph.
Specifications
| Size | LT265/75R16/10 |
| Tire Type | All Season |
| Service Description | 123/120Q |
| Load Index | 123/120 |
| Speed Rating | Q |
| Load Range | 10 |
| Section Width (mm) | 265 |
| Aspect Ratio | 75 |
| Overall Diameter (in) | 31.89 |
| Tread Depth (/32") | 18.5 |
Frequently asked questions
What does 123/120Q mean on the Cooper Discoverer STT Pro?
123/120Q breaks down as load index 123 — rated for 3,417 lbs per tire (120, or 3,086 lbs, in dual fitment) — with a Q speed rating, good for a maximum sustained 99 mph.
What kind of tire is the Cooper Discoverer STT Pro?
The Cooper Discoverer STT Pro in 265/75R16 is a all season tire.
Will 265/75R16 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 265/75R16, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 265/75R16 tire in stock to compare options.
Keep shopping
Shop all 265/75R16 tires, browse Cooper tires, see every Cooper Discoverer STT Pro size, or view all tires at ThreePiece.us.
- BRAND:
- Cooper
- Model:
- Discoverer STT Pro
- Size:
- LT265/75R16/10
- Aspect Ratio:
- 75
- Load Index:
- 123/120
- Load Range:
- 10
- Section Width:
- 265
- Service Description:
- 123/120Q
- Speed Index:
- Q
- Tire Rim Diameter:
- 31.89
- Tire Type:
- All Season
- Tread Depth:
- 18.5
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