2007 GMC Sierra — Classic 2500 HD 4wd Regular Cab

The 2007 GMC Sierra Classic 2500 HD 4wd Regular Cab came from the factory equipped with 245/75R16 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.

245/75R16

Section width245 mm
Aspect ratio (sidewall height)75% (183.8 mm)
Rim diameter16"
Overall tire diameter~30.5"
Revolutions per mile~662

Compare prices at:

What this size means for your GMC Sierra

On the 2007 GMC Sierra Classic 2500 HD 4wd Regular Cab, the factory 245/75R16 measures about 30.5″ in overall diameter with a 183.8 mm (7.2″) sidewall, and completes roughly 662 revolutions per mile. Its 75-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.

On a vehicle of this age, the GMC Sierra may have been refitted with a slightly different replacement size somewhere in its life, so check the current sidewall — not just the factory spec — before buying.

Other 2007 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.