Mickey Thompson MIK Baja Boss 305/55R20/12

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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 manufacturer lists the overall diameter of this specific tire as 20 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 120 — a maximum load of 3,086 lbs per tire. 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 305/55R20 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 120Q mean on the Mickey Thompson Baja Boss?

120Q breaks down as load index 120 — rated for 3,086 lbs per tire — with a Q speed rating, good for a maximum sustained 99 mph.

What kind of tire is the Mickey Thompson Baja Boss?

The Mickey Thompson Baja Boss in 305/55R20 is a all terrain tire.

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