Westlake WESTLAKE SA07 Sport A/S 245/55R18/4

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What 245/55R18 means

In the size 245/55R18, 245 is the section width in millimeters (9.65 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 134.8 mm (5.31 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 28.61 inches, turning roughly 705 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 18 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 103 — a maximum load of 1,929 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.

Specifications

Frequently asked questions

What are the treadwear and warranty ratings on the Westlake SA07 Sport A/S?

This tire carries a treadwear grade of 460, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 45K.

What does 103W mean on the Westlake SA07 Sport A/S?

103W breaks down as load index 103 — rated for 1,929 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.

What kind of tire is the Westlake SA07 Sport A/S?

The Westlake SA07 Sport A/S in 245/55R18 is a high-performance tire.

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