2018 Chevrolet Silverado — 1500 4wd Double Cab w/Performance Brake

The 2018 Chevrolet Silverado 1500 4wd Double Cab w/Performance Brake shipped with 2 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.

This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.

275/55R20

Section width275 mm
Aspect ratio (sidewall height)55% (151.3 mm)
Rim diameter20"
Overall tire diameter~31.9"
Revolutions per mile~632

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285/45R22

Section width285 mm
Aspect ratio (sidewall height)45% (128.3 mm)
Rim diameter22"
Overall tire diameter~32.1"
Revolutions per mile~628

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What this size means for your Chevrolet Silverado

On the 2018 Chevrolet Silverado 1500 4wd Double Cab w/Performance Brake, the factory 275/55R20 measures about 31.9″ in overall diameter with a 151.3 mm (6″) sidewall, and completes roughly 632 revolutions per mile. Its 55-series aspect ratio gives a balanced everyday-passenger profile — enough sidewall to soak up road shock while keeping steering response crisp. In tire terms it is a large-diameter fitment.

The 275/55R20 and 285/45R22 roll within 0.2″ (0.6%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.

Other 2018 Chevrolet Silverado trims

Chevrolet Silverado tire sizes by year

See every Chevrolet Silverado year & trim →

How to read a tire size

A tire size like 225/45R17 breaks down into three parts: the first number is the section width in millimeters (the tire's width from sidewall to sidewall), the second is the aspect ratio — the sidewall's height as a percentage of that width — and the number after the "R" is the rim diameter in inches. A letter prefix (P or LT) indicates Passenger or Light Truck construction; its absence usually means Euro-metric sizing.

Some trucks and off-road tires instead use "flotation" sizing, like 37X12.50R17 — here the numbers are the tire's overall diameter and width in inches directly, with the rim diameter last.

Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.