Chevrolet 1977 light duty truck Service Manual page 331

TIRES FOR LIGHT TRUCKS USED IN HIGHWAY SERVICE (Cont'd)
W heel Code
Ti re
Size
Regular Rally
__
YW 6 .5 0 -1 6
—
YW
7 .0 0 -1 6
—
YW 7 .0 0 -1 6
—
YW 7 .5 0 - 1 6
--
YW 7 .5 0 - 1 6
—
8 .7 5 - 1 6 .5
D W , F J
--
8 .7 5 - 1 6 .5
D W , F J
--
D W , FJ 8 .7 5 - 1 6 .5
TUBELESS TIRES MOUNTED ON 15° TAPERED BEAD SEAT DROP CENTER RIMS
__
CM 8 -1 7 .5
—
F B , UH
8 -1 9 .5
—
U H 8 -1 9 .5
W heel Code
Tire
Size
Regular Rally
—
F J , DW 8 .0 0 - 1 6 .5
—
F J , DW 8 .0 0 -1 6 .5
—
F J , DW
8 .0 0 R - 1 6 .5
—
F J , DW 8 .0 0 R -1 6 .5
—
F J , DW 8 .7 5 - 1 6 .5
- —
F J , DW 8 .7 5 - 1 6 .5
--
F J , DW 8 .7 5 - 1 6 .5
F J , DW — 8 .7 5 R -1 6 .5
F J , DW
8 .7 5 R -1 6 .5
1. The " cold " tire inflation pressure rating applies
to the tire pressure when the vehicle has not
been driven for three hours or m ore, or driven
less than one m ile.
2. It is normal for tire pressures to increase 4-8
PSI, or m ore, when the tires becom e "h o t"
from driving, D o n ot " b leed " or reduce tire in­
flation pressures after driving your vehicle.
Bleeding serves to reduce " cold " inflation
pressure and increase tire flexin g which can
result in tire damage and failure.
3. For sustained driving over 75 mph with pas­
senger car typ e tires, cold inflation pressures
should be increased 4 PSI above the recom ­
m ended cold inflation pressures in the Tire/
Wheel Load and Inflation Pressure Chart for
the load being carried up to a m axim um o f 32
PSI for load range B tires, 3 6 PSI for load
range C, and 4 0 PSI for load range D. Sus­
tained speeds above 75 mph are n ot recom ­
m ended when the 4 PSI adjustm ent exceeds
the m axim um pressures stated above.
4. For sustained driving over 65 mph w ith truck
typ e tires* cold inflation pressures should be
increased 10 PSI above th ose specified in the
Tire/W heel Load and Inflation Pressure charts
for the load being carried. Do not ex ceed the
m axim um w heel capacity show n in the Wheel
Code & Limits Chart. Sustained speeds above
65 MPH are n ot recom m ended where the 10
PSI pressure increase w ould exceed this m axi­
m um w heel capacity.
TIRE/WHEEL LOAD & INFLATION PRESSURE
TIRES USED AS DUALS
Load
Range
30 35
TUBE TYPE TIRES MOUNTED ON 5° TAPERED BEAD SEAT RIMS
1 1 2 0 1 2 2 5
C
1 2 6 0 1 3 6 5
C
1 2 6 0 1 3 6 5
D
1 5 6 5
C 1 4 3 0
D 1 4 3 0 1 5 6 5
C 1 3 8 0 1 5 1 5
D 1 3 8 0 1 5 1 5
E 1 3 8 0 1 5 1 5
D 1 4 4 5 1 5 7 5
—
—
D
— —
E
W ID E BASE TUBELESS TIRES USED AS DUALS
Load
Range
30 35
C 1 3 1 0
1 1 9 5
D 1 1 9 5 1 3 1 0
—
C
1 1 9 5
--
D
1 1 9 5
C 1 3 8 0 1 5 1 5
D 1 3 8 0 1 5 1 5
E 1 5 1 5
1 3 8 0
—
D 1 3 8 0
E
1 3 8 0
T ire Load Lim its at Various Inflation Pressures
4 0 45 5 0 55
1 3 2 0 1 4 2 0
1 4 7 5 1 5 8 0
1 4 7 5 1 5 8 0 1 6 8 5 1 7 8 0
1 6 9 0 1 8 1 5
2 0 4 0
1 6 9 0 1 8 1 5 1 9 3 0
1 6 3 0 1 7 5 0
1 6 3 0 1 7 5 0 1 8 5 5 1 9 7 0
1 6 3 0 1 7 5 0 1 8 5 5 1 9 7 0
1 8 2 0 1 9 3 5 2 0 5 0
1 7 0 0
1 9 9 0 2 1 1 0
1 8 5 0 2 2 3 0
1 9 9 0 2 1 1 0 2 2 3 0
1 8 5 0
Tire Load Limits at Various Inflation Pressures
4 0
45 50 55
1 4 1 5 1 5 2 0
1 4 1 5 1 5 2 0 1 6 2 0 1 7 1 0
1 3 1 0 1 4 1 5
1 5 2 0
1 6 2 0
1 3 1 0 1 4 1 5 1 5 2 0
1 6 3 0 1 7 5 0
1 6 3 0 1 7 5 0 1 8 5 5 1 9 7 0
1 6 3 0 1 7 5 0 1 8 5 5 1 9 7 0
1 5 1 5 1 6 3 0 1 7 5 0 1 8 5 5
1 5 1 5 1 6 3 0 1 7 5 0 1 8 5 5
For special operating con d ition s such as carry­
ing slide-in campers or other high center of
gravity loads, cold inflation pressures may be
increased up to 10 PSI above those show n in
the table. The total increase in cold inflation
pressures, how ever, m ust not exceed the m axi­
mum w heel capacity show n on the Wheel Code
& Limits Chart.
PROPERLY IN F LA TE D
R A D IA L TIRE
5. When using passenger car type snow tires cold
inflation pressures should be increased 4 PSI
(truck typ e sn ow tires, 10 PSI) above the rec­
om m ended pressures for the load being carried.
However, do not ex ceed the m axim um wheel
capacity show n in the Wheel Code & Limits
Chart. Sustained speeds above 75 MPH with
passenger car ty p e snow tires (6 5 MPH with
truck type sn ow tires) are n ot recom m ended.
6. Alw ays use a tire pressure gauge (a pock et
typ e gauge is recom m ended) when checking
inflation pressures. Radial tires may have the
appearance o f being under-inflated when at
recom m ended cold inflation.
60 65 7 0 75
1 8 7 0
2 1 4 0
2 0 7 0
2 3 6 0
2 0 7 0 2 1 7 5 2 2 6 0
2 1 5 5
2 3 5 0 2 4 6 0
2 3 5 0 2 4 6 0 2 5 7 0 2 6 8 0 (#)
(#) 2 7 8 0 @ 8 0 PSI
75
60 65 70
1 8 0 0
1 7 1 0
1 8 0 0
2 0 7 0
2 0 7 0 2 1 7 5 2 2 6 0 2 3 6 0
1 9 7 0 2 0 7 0
1 9 7 0
2 0 7 0 2 1 7 5 2 2 6 0
* 2 3 6 0 @ 8 0 P S I
PROPERLY IN F LA TE D BIAS
O R BIAS-BELTED TIRE
*