2014 GMC Sierra — 2500 HD 4wd Regular Cab

The 2014 GMC Sierra 2500 HD 4wd Regular Cab shipped with 4 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.

245/75R17

Section width245 mm
Aspect ratio (sidewall height)75% (183.8 mm)
Rim diameter17"
Overall tire diameter~31.5"
Revolutions per mile~641

Compare prices at:

265/70R17

Section width265 mm
Aspect ratio (sidewall height)70% (185.5 mm)
Rim diameter17"
Overall tire diameter~31.6"
Revolutions per mile~638

Compare prices at:

265/70R18

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

Compare prices at:

265/60R20

Section width265 mm
Aspect ratio (sidewall height)60% (159 mm)
Rim diameter20"
Overall tire diameter~32.5"
Revolutions per mile~620

Compare prices at:

What this size means for your GMC Sierra

On the 2014 GMC Sierra 2500 HD 4wd Regular Cab, the factory 245/75R17 measures about 31.5″ in overall diameter with a 183.8 mm (7.2″) sidewall, and completes roughly 641 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.

The 245/75R17 and 265/70R17 roll within 0.1″ (0.3%) 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 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.