Westlake WESTLAKE SU318 215/75R15/4

Looking for a 215/75R15 high-performance tire? The Westlake SU318 is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.

What 215/75R15 means

In the size 215/75R15, 215 is the section width in millimeters (8.46 in), 75 is the aspect ratio — the sidewall stands 75% as tall as the tire is wide, or 161.2 mm (6.35 in) — R denotes radial construction, and 15 is the wheel diameter in inches. That works out to an overall diameter of about 27.70 inches, turning roughly 728 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 15 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 100 — a maximum load of 1,764 lbs per tire. The speed symbol T corresponds to a maximum sustained speed of 118 mph.

Specifications

Frequently asked questions

What kind of tire is the Westlake SU318?

The Westlake SU318 in 215/75R15 is a high-performance tire.

What are the treadwear and warranty ratings on the Westlake SU318?

This tire carries a treadwear grade of 500, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 50K.

What does 100T mean on the Westlake SU318?

100T breaks down as load index 100 — rated for 1,764 lbs per tire — with a T speed rating, good for a maximum sustained 118 mph.

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