Cooper Discoverer S/T Maxx LT255/85R16/10 123/120Q - 170074004

Looking for a 255/85R16 all season tire? The Cooper Discoverer S/T Maxx is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.

What 255/85R16 means

In the size 255/85R16, 255 is the section width in millimeters (10.04 in), 85 is the aspect ratio — the sidewall stands 85% as tall as the tire is wide, or 216.8 mm (8.53 in) — R denotes radial construction, and 16 is the wheel diameter in inches. That works out to an overall diameter of about 33.07 inches, turning roughly 610 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 32.8 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

Frequently asked questions

What kind of tire is the Cooper Discoverer S/T Maxx?

The Cooper Discoverer S/T Maxx in 255/85R16 is a all season tire.

Will 255/85R16 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 255/85R16, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.

What does 123/120Q mean on the Cooper Discoverer S/T Maxx?

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.

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