Pirelli PIR P-Zero (PZ4) Sport 255/40R23XL

The Pirelli P-Zero (PZ4) Sport in 255/40R23 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 255/40R23 means

In the size 255/40R23, 255 is the section width in millimeters (10.04 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 102.0 mm (4.02 in) — R denotes radial construction, and 23 is the wheel diameter in inches. That works out to an overall diameter of about 31.03 inches, turning roughly 650 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 23 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 104 — a maximum load of 1,984 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.

Specifications

Frequently asked questions

What does 104Y mean on the Pirelli P-Zero (PZ4) Sport?

104Y breaks down as load index 104 — rated for 1,984 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) Sport?

The Pirelli P-Zero (PZ4) Sport in 255/40R23 is a high performance tire.

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

This tire carries a treadwear grade of 280, traction grade AA, temperature grade A under UTQG.

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