Cooper Discoverer STT Pro LT295/65R20/10 129/126Q - 170105006

The Cooper Discoverer STT Pro in 295/65R20 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 295/65R20 means

In the size 295/65R20, 295 is the section width in millimeters (11.61 in), 65 is the aspect ratio — the sidewall stands 65% as tall as the tire is wide, or 191.8 mm (7.55 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 35.10 inches, turning roughly 575 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 35.43 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 129 — a maximum load of 4,079 lbs per tire, or 126 (3,748 lbs) per tire when mounted as duals. The speed symbol Q corresponds to a maximum sustained speed of 99 mph.

Specifications

Frequently asked questions

What does 129/126Q mean on the Cooper Discoverer STT Pro?

129/126Q breaks down as load index 129 — rated for 4,079 lbs per tire (126, or 3,748 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 295/65R20 is a all season tire.

Will 295/65R20 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 295/65R20, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.

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