Nexen NEX Roadian GTX 215/55R18

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What 215/55R18 means

In the size 215/55R18, 215 is the section width in millimeters (8.46 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 118.3 mm (4.66 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 27.31 inches, turning roughly 738 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 99 — a maximum load of 1,709 lbs per tire. The speed symbol V corresponds to a maximum sustained speed of 149 mph.

Specifications

Frequently asked questions

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 99V mean on the Nexen Roadian GTX?

99V breaks down as load index 99 — rated for 1,709 lbs per tire — with a V speed rating, good for a maximum sustained 149 mph.

What kind of tire is the Nexen Roadian GTX?

The Nexen Roadian GTX in 215/55R18 is a touring tire.

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