Nexen NEX Roadian GTX 255/55R18

Looking for a 255/55R18 touring tire? The Nexen Roadian GTX is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.

What 255/55R18 means

In the size 255/55R18, 255 is the section width in millimeters (10.04 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 140.2 mm (5.52 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 29.04 inches, turning roughly 694 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 109 — a maximum load of 2,271 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 Nexen Roadian GTX?

The Nexen Roadian GTX in 255/55R18 is a touring tire.

What are the treadwear and warranty ratings on the Nexen Roadian GTX?

This tire carries a treadwear grade of 680, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 70K.

What does 109V mean on the Nexen Roadian GTX?

109V breaks down as load index 109 — rated for 2,271 lbs per tire — with a V speed rating, good for a maximum sustained 149 mph.

Keep shopping

Shop all 255/55R18 tires, see every Nexen Roadian GTX size, or view all tires at ThreePiece.us.