GMC 1982 Light Duty Truck Service Manual page 396

3E-4 WHEELS A N D TIRES
LIM IT E D SUCH T H A T NEITHER THE W HEEL OR TIR E IN F LA T IO N PRESSURE OR LOAD LIM ITS ARE EXCEEDEDI
weighing the vehicle on a scale, the correct cold inflation
pressures for the actual tire loads can be obtained from the
T ire/W heel Load and Inflation Pressure Charts shown in
this section. Refer to Section OB for additional information
on inflation pressure.
CORRECTING IRREGULAR TIRE WEAR
Heel and Toe Wear
This is a saw-toothed effect where one end of each tread
block is worn more than the other. The end that wears is the
one that first grips the road when the brakes are applied.
Heel and toe wear is less noticeable on rear tires than
on front tires, because the propelling action of the rear
wheels creates a force which tends to wear the opposite end
of the tread blocks. The two forces, propelling and braking,
make for more even wear of the rear tires, whereas only the
braking forces act on the front wheels, and the saw-tooth
eff ect is more noticeable.
A certain am ount of heel and toe wear is normal.
Excessive wear is usually due to high speed driving and
T IR E A N D W H E E L L O A D L IM IT C H A R T S
(TIRE & WHEEL LO AD LIM IT S ARE SHOWN BELOW VEH IC LE LOADING MUST BE
R A D IA L T IR E S IZE A N D L O A D L IM IT S - LBS (kg)
Tire Load
Size Range 44 (300) 51 (350)
36 (250)
M E T R IC R A D IA L T IR E S U S E D A S S IN G L E S
1742
1532
LT 215/85R 16 C
(790)
(695)
1742
1532
D
LT 215/85R 16
(695) (790)
1742 1984
L T 2 35 /85R 16 D
(790) (900)
•
1742 1984
E
LT235/85R 16
(790) (900)
M E T R IC R A D IA L T IR E S USED AS D U A L S
1587
1389
LT 2 15 /85R 16
C
(630) (720)
1389 1587
LT 215/85R 16 D
(630) (720)
B IA S T IR E S IZ E A N D L O A D L IM IT S - LBS (kg)
Tire Load
Size Range 30 (207) ] 35 (241) | 40 (276) 145 (3 1 0 )|5 0 (345) 55 (379)160 (414)165 (4 4 8)| 70 (483) 175 (517)
B IA S T IR E S U S E D A S S IN G LE S
1770 1930
1620
7.50-16 C
(875)
(735) (803)
1770 1930
1620
7.50-16 D
(803)
(735) (875)
1930
1620 1770
7.50-16 E
(875)
(735) (803)
B IA S T IR E S U S E D A S D U A L S
1565 1690
1430
7.50-16 C
(767)
(649) (710)
1565 1690
1430
D
7.50-16
(710) (767)
(649)
W H E E L CO D E A N D L IM IT S
Wheel Max Pressure
Max Load
Code
Size
Lbs (kg) P SI (kPa)
AA
16x6.5 L 3045 (1381) 90 (621)
AF 16x6 K 2440 (1107) 75 (517)
BF 16x6.5 L 2780 (1261)
85 (586)
BJ 15x8JJ 1910 (866) 40 (276)
BK 15x7 JJ 1670 (757) 40 (276)
40 (276)
BM 15x8 JJ 2030 (921)
Fig. 3E-6--Tire/Wheel Load and Inflation Pressure
Inflation Pressure - PSI (kPa)
| 58 (400) 65 (450) 73 (500)
1940
(880)
2127 2315
1940
(1050)
(880) (965)
2205 2425 2623
(1000) (1100) (1190)
2844
2205 2425 2623
(1190)
(1000) (1100) (1290)
1764
(800)
1764 1918 2105
(870) (955)
(800)
Inflation Pressure - PSI (kPa)
2060
(934)
2310
2060 2190 2440
(934)
(993) (1048) (1107)
2190 2310
2060 2560 2670
2440
(934)
(1048) (1161) (1211)
(993) (1107)
1815
(823)
1815 1930 2040 2140
(823) (875) (925) (971)
Wheel Max Load
Code
Size
Lbs (kg)
C F 15x7 JJ 1670 (757)
C K
15x8 JJ 1910 (866)
! UW 15x7 JJ 2030 (921)
u x 15x7 JJ
2030 (921)
XH 1585 (719)
15x6 JJ
XW
15x6 JJ 1910 (866)
X X 15x6 JJ 2040 (925)
z c
2030 (921)
15x8 JJ
excessive use of brakes. The best remedy, in addition to
cautioning the owner on his driving habits, is to interchange
tires regularly.
Side Wear
This may be caused by incorrect wheel cam ber,
underinflation, high cambered roads or by taking corners at
too high a rate of speed. The first two causes are the most
common. Cam ber wear can be readily identified because it
occurs only on one side of the treads, whereas underinflation
causes wear on both sides. Cam ber wear requires correction
of the camber first and then interchanging tires. There is, of
course, no correction for high cambered roads. Cornering
wear is discussed further on.
Misalignment Wear
This is wear due to excessive toe-in or toe-out. In either
case, tires will revolve with a side motion and scrape the
tread rubber off. If misalignment is severe, the rubber will
be scraped off of both tires; if slight, only one will be
affected. The
80 (550)
3042
(1380)
2780
(1261)
Max Pressure
PSI (kPa)
40 (276)
40 (276)
41 (283)
41 (283)
40 (276)
70 (483)
70 (483)
40 (276)
scraping action against the face