Nexen NEX Roadian MTX 305/70R18/12

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What 305/70R18 means

In the size 305/70R18, 305 is the section width in millimeters (12.01 in), 70 is the aspect ratio — the sidewall stands 70% as tall as the tire is wide, or 213.5 mm (8.41 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 34.81 inches, turning roughly 579 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 128 — a maximum load of 3,968 lbs per tire, or 125 (3,638 lbs) per tire when mounted as duals. The speed symbol Q corresponds to a maximum sustained speed of 99 mph.

Load Range F corresponds to a 12-ply rating.

Specifications

Frequently asked questions

Will 305/70R18 tires fit my vehicle?

Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 305/70R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.

What does 128/125Q mean on the Nexen Roadian MTX?

128/125Q breaks down as load index 128 — rated for 3,968 lbs per tire (125, or 3,638 lbs, in dual fitment) — with a Q speed rating, good for a maximum sustained 99 mph.

What kind of tire is the Nexen Roadian MTX?

The Nexen Roadian MTX in 305/70R18 is a mud terrain tire.

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