Pirelli PIR P-Zero (PZ4) 235/55R18

Looking for a 235/55R18 high-performance tire? The Pirelli P-Zero (PZ4) is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.

What 235/55R18 means

In the size 235/55R18, 235 is the section width in millimeters (9.25 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 129.2 mm (5.09 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 28.18 inches, turning roughly 716 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 18 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 100 — a maximum load of 1,764 lbs per tire. The speed symbol V corresponds to a maximum sustained speed of 149 mph.

Specifications

Frequently asked questions

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

The Pirelli P-Zero (PZ4) in 235/55R18 is a high-performance tire.

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

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

What does 100V mean on the Pirelli P-Zero (PZ4)?

100V breaks down as load index 100 — rated for 1,764 lbs per tire — with a V speed rating, good for a maximum sustained 149 mph.

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