Nitto NIT NT420V LT305/55R20/12

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What 305/55R20 means

In the size 305/55R20, 305 is the section width in millimeters (12.01 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 167.8 mm (6.60 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 33.21 inches, turning roughly 607 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 service description on this tire decodes to a load index of 125 — a maximum load of 3,638 lbs per tire, or 122 (3,307 lbs) per tire when mounted as duals. The speed symbol S corresponds to a maximum sustained speed of 112 mph.

Load Range F corresponds to a 12-ply rating.

Specifications

Frequently asked questions

Will 305/55R20 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 305/55R20, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 305/55R20 tire in stock to compare options.

What does 125/122S mean on the Nitto NT420V?

125/122S breaks down as load index 125 — rated for 3,638 lbs per tire (122, or 3,307 lbs, in dual fitment) — with an S speed rating, good for a maximum sustained 112 mph.

What kind of tire is the Nitto NT420V?

The Nitto NT420V in 305/55R20 is a summer tire.

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