Pirelli Winter SottoZero Series 3 355/25R21XL 107W - 2499700

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What 355/25R21 means

In the size 355/25R21, 355 is the section width in millimeters (13.98 in), 25 is the aspect ratio — the sidewall stands 25% as tall as the tire is wide, or 88.8 mm (3.49 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 27.99 inches, turning roughly 721 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 service description on this tire decodes to a load index of 107 — a maximum load of 2,150 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.

Load Range E corresponds to a 10-ply rating.

Specifications

Frequently asked questions

Will 355/25R21 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 355/25R21, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.

What does 107W mean on the Pirelli Winter SottoZero Series 3?

107W breaks down as load index 107 — rated for 2,150 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.

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

The Pirelli Winter SottoZero Series 3 in 355/25R21 is a winter tire.

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