For dynamic balancing, the balance equipment is
designed to indicate the location and amount of
weight to be applied to both the inner and outer rim
flanges (Fig. 7).
Aluminum wheels use unique wheel weights (Fig.
8). Each wheel weight is designed to fit the contoured
surface of the wheel (Fig. 8). When balancing an alu-
minum wheel, the correct wheel weight must be
used. Do not use any other type of wheel weight. It
will not properly fit the contour of the wheel.
Always verify the Balance. When using off-vehicle
equipment, rotate assembly 180 degrees on balance
equipment to verify balance. Variation should not be
more than 0.125 (
1
⁄
8
) ounce. If variation is more than
0.125 ounce, balancing equipment could be malfunc-
tioning.
If difficult to balance, break down the wheel and
tire assembly and check for loose debris inside tire.
Prior to disassembly, mark (index) the tire at the
valve stem. Use this mark in order to remount the
tire in its original orientation with respect to the
wheel.
STANDARD PROCEDURE - TIRE AND WHEEL
MATCH MOUNTING
Steel wheels and tires are match mounted at the
factory. This means that the high spot of the tire is
matched to the low spot on the wheel rim. This tech-
nique is used to reduce runout in the wheel/tire
assembly. The high spot on the tire is marked with a
paint mark or a bright colored adhesive label on the
outboard sidewall. The low spot on the rim is identi-
fied with a label on the outside of the rim and a dot
or line in the drop well on the tire side of the rim. If
the outside label has been removed the tire will have
to be removed to locate the dot or line on the inside
of the rim.
Before dismounting a tire from its wheel, a refer-
ence mark should be placed on the tire at the valve
stem location. This reference will ensure that it is
remounted in the original position on the wheel.
Fig. 7 Dynamic Unbalance & Balance
1 - CENTER LINE OF SPINDLE
3 - CORRECTIVE WEIGHT LOCATION
2 - ADD BALANCE WEIGHTS HERE
4 - HEAVY SPOT WHEEL SHIMMY AND VIBRATION
Fig. 8 Aluminum Wheel Weight
1 - TIRE
2 - WHEEL
3 - WHEEL WEIGHT
22 - 4
TIRES/WHEELS
PT
TIRES/WHEELS (Continued)