Pirelli P-Zero (PZ4) 315/30R21 105Y - 3787500

Shop the Pirelli P-Zero (PZ4) 315/30R21 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.

What 315/30R21 means

In the size 315/30R21, 315 is the section width in millimeters (12.40 in), 30 is the aspect ratio — the sidewall stands 30% as tall as the tire is wide, or 94.5 mm (3.72 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 28.44 inches, turning roughly 709 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 105 — a maximum load of 2,039 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.

Load Range E corresponds to a 10-ply rating.

Specifications

Frequently asked questions

Will 315/30R21 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 315/30R21, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.

What does 105Y mean on the Pirelli P-Zero (PZ4)?

105Y breaks down as load index 105 — rated for 2,039 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.

What kind of tire is the Pirelli P-Zero (PZ4)?

The Pirelli P-Zero (PZ4) in 315/30R21 is a summer tire.

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