Westlake WESTLAKE SL309 235/80R17/10

Looking for a 235/80R17 high-performance tire? The Westlake SL309 is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.

What 235/80R17 means

In the size 235/80R17, 235 is the section width in millimeters (9.25 in), 80 is the aspect ratio — the sidewall stands 80% as tall as the tire is wide, or 188.0 mm (7.40 in) — R denotes radial construction, and 17 is the wheel diameter in inches. That works out to an overall diameter of about 31.80 inches, turning roughly 634 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 17 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 120 — a maximum load of 3,086 lbs per tire, or 117 (2,833 lbs) per tire when mounted as duals. The speed symbol Q corresponds to a maximum sustained speed of 99 mph.

Load Range E corresponds to a 10-ply rating.

Specifications

Frequently asked questions

What kind of tire is the Westlake SL309?

The Westlake SL309 in 235/80R17 is a high-performance tire.

What warranty does the Westlake SL309 carry?

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

What does 120/117Q mean on the Westlake SL309?

120/117Q breaks down as load index 120 — rated for 3,086 lbs per tire (117, or 2,833 lbs, in dual fitment) — with a Q speed rating, good for a maximum sustained 99 mph.

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