Cooper Discoverer Rugged Trek 285/65R20 127/124R - 170273046

The Cooper Discoverer Rugged Trek in 285/65R20 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 285/65R20 means

In the size 285/65R20, 285 is the section width in millimeters (11.22 in), 65 is the aspect ratio — the sidewall stands 65% as tall as the tire is wide, or 185.2 mm (7.29 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 34.59 inches, turning roughly 583 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 34.8 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 127 — a maximum load of 3,858 lbs per tire, or 124 (3,527 lbs) per tire when mounted as duals. The speed symbol R corresponds to a maximum sustained speed of 106 mph.

Load Range E corresponds to a 10-ply rating.

Specifications

Frequently asked questions

What does 127/124R mean on the Cooper Discoverer Rugged Trek?

127/124R breaks down as load index 127 — rated for 3,858 lbs per tire (124, or 3,527 lbs, in dual fitment) — with an R speed rating, good for a maximum sustained 106 mph.

What kind of tire is the Cooper Discoverer Rugged Trek?

The Cooper Discoverer Rugged Trek in 285/65R20 is a all season tire.

What warranty does the Cooper Discoverer Rugged Trek carry?

The manufacturer's warranty on this tire is 55K.

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