1981 GMC C1500 Sierra Grande Tire Sizes
Factory original equipment (OE) tire specifications.
(7/16 & 1/2 inch studs)(GVWR 4900)
Tire Size
GR78-15/B
Load Index
Speed Rating
(7/16 & 1/2 inch studs)(GVWR 4900)
Tire Size
P215/75R15
Load Index
Speed Rating
(7/16 & 1/2 inch studs)(GVWR 4900)
Tire Size
P235/75R15
Load Index
Speed Rating
(7/16 & 1/2 inch studs)(GVWR 5400)
Tire Size
P215/75R15
Load Index
Speed Rating
(7/16 & 1/2 inch studs)(GVWR 5400)
Tire Size
P235/75R15
Load Index
Speed Rating
(7/16 & 1/2 inch studs)(GVWR 5400)
Tire Size
LR60-15/B
Load Index
Speed Rating
(7/16 & 1/2 inch studs)(GVWR 5600)
Tire Size
P235/75R15
Load Index
Speed Rating
(7/16 & 1/2 inch studs)(GVWR 5600)
Tire Size
LR60-15/B
Load Index
Speed Rating
(9/16 inch studs)(GVWR 4900)
Tire Size
GR78-15/B
Load Index
Speed Rating
(9/16 inch studs)(GVWR 4900)
Tire Size
P215/75R15
Load Index
Speed Rating
(9/16 inch studs)(GVWR 4900)
Tire Size
P235/75R15
Load Index
Speed Rating
(9/16 inch studs)(GVWR 5400)
Tire Size
P215/75R15
Load Index
Speed Rating
(9/16 inch studs)(GVWR 5400)
Tire Size
P235/75R15
Load Index
Speed Rating
(9/16 inch studs)(GVWR 5400)
Tire Size
LR60-15/B
Load Index
Speed Rating
(9/16 inch studs)(GVWR 5600)
Tire Size
P235/75R15
Load Index
Speed Rating
(9/16 inch studs)(GVWR 5600)
Tire Size
LR60-15/B
Load Index
Speed Rating
w/F44 Option (7/16 & 1/2 inch studs)
Tire Size
P235/75R15
Load Index
Speed Rating
w/F44 Option (7/16 & 1/2 inch studs)
Tire Size
LR60-15/B
Load Index
Speed Rating
w/F44 Option (9/16 inch studs)
Tire Size
P235/75R15
Load Index
Speed Rating
w/F44 Option (9/16 inch studs)
Tire Size
LR60-15/B
Load Index
Speed Rating