2008 GMC Sierra Tire Pressure & Sizes


On this page you can first find a list of the trims for the 2008 GMC Sierra along with the tire sizes you can expect to find on them.

Once you have your correct tire size you can then scroll down to the pressures chart and cross-reference it to find the recommended front and rear pressure rating.

Trim Size Icon 2008 GMC Sierra Trims

GMC Sierra models built during 2008 were offered in the following trims with these tire sizes fitted as standard.

Trim Name Tire Size/s
2500 HD 2wd Crew Cab

  • 245/75R16 Pressure Icon Cart Icon
  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
2500 HD 2wd Extended Cab

  • 245/75R16 Pressure Icon Cart Icon
  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
2500 HD 2wd Regular Cab

  • 245/75R16 Pressure Icon Cart Icon
2500 HD 4wd Crew Cab

  • 245/75R16 Pressure Icon Cart Icon
  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
2500 HD 4wd Extended Cab

  • 245/75R16 Pressure Icon Cart Icon
  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
2500 HD 4wd Regular Cab

  • 245/75R16 Pressure Icon Cart Icon
3500 HD 2wd Crew Cab

  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
3500 HD 2wd Crew Cab Dually

  • 225/75R17 Pressure Icon Cart Icon
3500 HD 2wd Extended Cab

  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
3500 HD 2wd Extended Cab Dually

  • 225/75R17 Pressure Icon Cart Icon
3500 HD 2wd Regular Cab

  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
3500 HD 4wd Crew Cab

  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
3500 HD 4wd Crew Cab Dually

  • 225/75R17 Pressure Icon Cart Icon
3500 HD 4wd Extended Cab

  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
3500 HD 4wd Extended Cab Dually

  • 225/75R17 Pressure Icon Cart Icon
3500 HD 4wd Regular Cab

  • 265/75R16 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
3500 HD 4wd Regular Cab Dually

  • 225/75R17 Pressure Icon Cart Icon
C1500 Crew Cab

  • 245/70R17 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
  • 275/55R20 Pressure Icon Cart Icon
C1500 Extended Cab

  • 245/70R17 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
  • 265/65R18 Pressure Icon Cart Icon
  • 275/55R20 Pressure Icon Cart Icon
C1500 Regular Cab

  • 245/70R17 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
  • 275/55R20 Pressure Icon Cart Icon
Denali 2wd

  • 265/65R18 Pressure Icon Cart Icon
  • 275/55R20 Pressure Icon Cart Icon
Denali 4wd

  • 265/65R18 Pressure Icon Cart Icon
  • 275/55R20 Pressure Icon Cart Icon
K1500 Crew Cab

  • 265/70R17 Pressure Icon Cart Icon
  • 275/55R20 Pressure Icon Cart Icon
K1500 Extended Cab

  • 245/70R17 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
  • 265/65R18 Pressure Icon Cart Icon
  • 275/55R20 Pressure Icon Cart Icon
K1500 Regular Cab

  • 245/70R17 Pressure Icon Cart Icon
  • 265/70R17 Pressure Icon Cart Icon
  • 275/55R20 Pressure Icon Cart Icon

Tire Pressure Icon 2008 Sierra Tire Pressures By Size

GMC Sierra models built in 2008 with the following tire sizes are recommended to be kept at the following pressures.

Tire Size Front Rear
LT245/70R17/C 108Q

"LT" tires are designed for "light-trucks" carrying loads such as pickups

45 PSI 45 PSI
P245/70R17 108S

"P" tires are designed for carrying "passengers" only

35 PSI 35 PSI
P265/65R18 112S

"P" tires are designed for carrying "passengers" only

30 - 35 PSI 30 - 35 PSI
P265/70R17 113S

"P" tires are designed for carrying "passengers" only

35 PSI 35 PSI
P275/55R20 111S

"P" tires are designed for carrying "passengers" only

30 PSI 30 PSI
LT245/75R16/E 120S

"LT" tires are designed for "light-trucks" carrying loads such as pickups

50 - 65 PSI 80 PSI
LT265/70R17/E 121Q

"LT" tires are designed for "light-trucks" carrying loads such as pickups

60 PSI 75 PSI
LT225/75R17/E 113Q

"LT" tires are designed for "light-trucks" carrying loads such as pickups

65 PSI 80 PSI
LT265/75R16/E 123Q

"LT" tires are designed for "light-trucks" carrying loads such as pickups

60 PSI 75 PSI

What Do These Numbers Mean?

When comparing tires you will find that they display various numbers and codes along the edges.

These numbers help you choose the right tire (size and speed rating) for your car and the following image shows you what each of them mean:

Tire codes guide

GMC Sierra

GMC Sierra Image

We have found 25 different tire sizes for the 2008 GMC Sierra as well as the correct pressure to inflate them to.