2016 GMC Acadia — Denali FWD

The 2016 GMC Acadia Denali FWD came from the factory equipped with 255/55R20 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.

255/55R20

Section width255 mm
Aspect ratio (sidewall height)55% (140.3 mm)
Rim diameter20"
Overall tire diameter~31"
Revolutions per mile~650

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What this size means for your GMC Acadia

On the 2016 GMC Acadia Denali FWD, the factory 255/55R20 measures about 31″ in overall diameter with a 140.3 mm (5.5″) sidewall, and completes roughly 650 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.

Other 2016 GMC Acadia trims

GMC Acadia tire sizes by year

See every GMC Acadia 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.