Pirelli Scorpion Zero All Season 315/40ZR21XL 115(Y) - 2857400

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What 315/40R21 means

In the size 315/40R21, 315 is the section width in millimeters (12.40 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 126.0 mm (4.96 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 30.92 inches, turning roughly 652 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 115 — a maximum load of 2,679 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

What are the treadwear and warranty ratings on the Pirelli Scorpion Zero All Season?

This tire carries a treadwear grade of 400, traction grade A, temperature grade A under UTQG.

What does 115Y mean on the Pirelli Scorpion Zero All Season?

115Y breaks down as load index 115 — rated for 2,679 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.

What kind of tire is the Pirelli Scorpion Zero All Season?

The Pirelli Scorpion Zero All Season in 315/40R21 is a all season tire.

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