Pirelli PIR Winter SottoZero Series 3 245/45R18XL

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What 245/45R18 means

In the size 245/45R18, 245 is the section width in millimeters (9.65 in), 45 is the aspect ratio — the sidewall stands 45% as tall as the tire is wide, or 110.2 mm (4.34 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 26.68 inches, turning roughly 756 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 100 — a maximum load of 1,764 lbs per tire. The speed symbol V corresponds to a maximum sustained speed of 149 mph.

Specifications

Frequently asked questions

Will 245/45R18 tires fit my vehicle?

Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 245/45R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 245/45R18 tire in stock to compare options.

What does 100V mean on the Pirelli Winter SottoZero Series 3?

100V breaks down as load index 100 — rated for 1,764 lbs per tire — with a V speed rating, good for a maximum sustained 149 mph.

What kind of tire is the Pirelli Winter SottoZero Series 3?

The Pirelli Winter SottoZero Series 3 in 245/45R18 is a high performance tire.

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