Pirelli PIR P-Zero (PZ4) 245/35R21 96Y

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What 245/35R21 means

In the size 245/35R21, 245 is the section width in millimeters (9.65 in), 35 is the aspect ratio — the sidewall stands 35% as tall as the tire is wide, or 85.8 mm (3.38 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 27.75 inches, turning roughly 727 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 96 — a maximum load of 1,565 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.

Specifications

Frequently asked questions

What are the treadwear and warranty ratings on the Pirelli P-Zero (PZ4)?

This tire carries a treadwear grade of 220, traction grade AA, temperature grade A under UTQG.

What does 96Y mean on the Pirelli P-Zero (PZ4)?

96Y breaks down as load index 96 — rated for 1,565 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 245/35R21 is a high-performance tire.

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