Westlake WESTLAKE SL309 285/75R16/8

Looking for a 285/75R16 high-performance tire? The Westlake SL309 is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.

What 285/75R16 means

In the size 285/75R16, 285 is the section width in millimeters (11.22 in), 75 is the aspect ratio — the sidewall stands 75% as tall as the tire is wide, or 213.8 mm (8.42 in) — R denotes radial construction, and 16 is the wheel diameter in inches. That works out to an overall diameter of about 32.83 inches, turning roughly 614 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 16 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 122 — a maximum load of 3,307 lbs per tire, or 119 (2,998 lbs) per tire when mounted as duals. The speed symbol Q corresponds to a maximum sustained speed of 99 mph.

Load Range D corresponds to a 8-ply rating.

Specifications

Frequently asked questions

What kind of tire is the Westlake SL309?

The Westlake SL309 in 285/75R16 is a high-performance tire.

What warranty does the Westlake SL309 carry?

The manufacturer's warranty on this tire is 40K.

What does 122/119Q mean on the Westlake SL309?

122/119Q breaks down as load index 122 — rated for 3,307 lbs per tire (119, or 2,998 lbs, in dual fitment) — with a Q speed rating, good for a maximum sustained 99 mph.

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