Pirelli PIR Scorpion Zero All Season 315/40R21

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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 manufacturer lists the overall diameter of this specific tire as 21 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 111 — a maximum load of 2,403 lbs per tire. The speed symbol H corresponds to a maximum sustained speed of 130 mph.

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 500, traction grade A, temperature grade A under UTQG.

What does 111H mean on the Pirelli Scorpion Zero All Season?

111H breaks down as load index 111 — rated for 2,403 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.

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

The Pirelli Scorpion Zero All Season in 315/40R21 is a high performance tire.

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