2014 GMC Sierra — 3500 HD 4wd Single Rear Wheel

The 2014 GMC Sierra 3500 HD 4wd Single Rear Wheel came from the factory equipped with 265/70R18 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.

265/70R18

Section width265 mm
Aspect ratio (sidewall height)70% (185.5 mm)
Rim diameter18"
Overall tire diameter~32.6"
Revolutions per mile~619

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What this size means for your GMC Sierra

On the 2014 GMC Sierra 3500 HD 4wd Single Rear Wheel, the factory 265/70R18 measures about 32.6″ in overall diameter with a 185.5 mm (7.3″) sidewall, and completes roughly 619 revolutions per mile. Its 70-series aspect ratio gives a tall sidewall of the kind used on trucks, SUVs, and older passenger cars, built for cushioning and load. In tire terms it is a passenger (P-metric / Euro-metric) size.

Other 2014 GMC Sierra trims

GMC Sierra tire sizes by year

See every GMC Sierra 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.