Nexen NEX Roadian HTX 2 255/70R18

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What 255/70R18 means

In the size 255/70R18, 255 is the section width in millimeters (10.04 in), 70 is the aspect ratio — the sidewall stands 70% as tall as the tire is wide, or 178.5 mm (7.03 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 32.06 inches, turning roughly 629 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 113 — a maximum load of 2,535 lbs per tire. The speed symbol T corresponds to a maximum sustained speed of 118 mph.

Load Range B corresponds to a 4-ply rating.

Specifications

Frequently asked questions

What are the treadwear and warranty ratings on the Nexen Roadian HTX 2?

This tire carries a treadwear grade of 700, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 70K.

What does 113T mean on the Nexen Roadian HTX 2?

113T breaks down as load index 113 — rated for 2,535 lbs per tire — with a T speed rating, good for a maximum sustained 118 mph.

What kind of tire is the Nexen Roadian HTX 2?

The Nexen Roadian HTX 2 in 255/70R18 is a highway tire.

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