MAlNTENANCE
LOAD AND INFLATION CHART
WIDE BASE TIRES FOR TRUCKS, BUSSES, TRAILERS AND
MULTIPURPOSE PASSENGER VEHICLES USED IN HIGHWAY SERVICE
(Bias and Radial Ply Tubeless)
TIRE AND RIM ASSOCIATION STANDARD
TIRES USED AS SINGLES
Tire identification
Tire Load Limits at Various Inflation Pressures
Size
Load Range
45
50
55
60
65
70
75
80
16.3 x 22.5
H
6590
701
7410
7790
8170
8540
8890
9230
TIRES USED AS DUALS
Tire identification
Tire Load Limits at Various Inflation Pressures
Size
Load Range
55
60
65
70
75
80
12.00 x 20
G
4930
5190
5440
5680
5910
6140
Use care in matching dual tires. Tires, which differ
CONVERSION OF PLY RATING TO
more than 1/4 inch in diameter of 3/4 inch in
LOAD RANGE DESIGNATION
circumference, should not be mounted on the same dual
wheel. Should it become necessary to mount two tires
Load Range
Replaces Ply Rating
of unequal size on the same dual wheel, place the larger
or less worn tire on the outside.
A
2
B
4
C
6
When mounting tires on tandem drive axles, follow
the same instructions as specified for dual tires.
D
8
However, never install the four largest tires on one
driving axle and the four smallest tires on the other. This
method of tire mounting will cause high axle lubricant
E
10
temperatures which may lead to premature axle
F
12
TIRE SWITCHING SEQUENCE
G
14
Tires should be cross switched at regular intervals to
attain maximum tire life.
H
16
FRONT WHEEL ALIGNMENT
J
18
To guard against excessive tire wear, have the front
L
20
wheel alignment inspected occasionally by your IH
Branch or Dealer for toe-in.
M
22
N
24
69