30
BALANCING PROCEDURES
Lug Centric
A lug centric wheel is identified by removing the lug nuts
(or bolts) and moving the wheel up, down, and side-to-
side. If movement around the hub is apparent, the wheel
is centered on the vehicle by the lugs or studs of the axle
flange.
GAP BETWEEN
HUB AND WHEEL
Figure 97.
The static imbalance and radial force variation of a lug
centric wheel may be greatly changed when the centering
of the wheel differs on the vehicle.
To verify if the wheel is lug centric:
Remove the lug nuts (or bolts) and try to move
the wheel up/down and side/side on the hub.
A lug centric wheel will display noticeable
movement.
Use “Step-torque” star pattern to proper torque
specification.
When mounting a lug centric wheel to a
vehicle, extreme centering care must be taken
by ensuring the lug nuts (bolts) are tightened
equally, while rotating the wheel.
1
3
2
4
1
3
2
4
5
1
3
2
4
5
6
Figure 98.
3.6 On-Vehicle Wheel Installation
Methods
Hub Centric
A hub centric wheel is aligned to the hub by the center
bore of the wheel. The vehicle weight rests on the hub
bore. The clearance between the hub bore and the hub
on a hub centric wheel is between 0.003 and 0.004 of an
inch. A hub centric wheel is identified by removing the
lug nuts (or bolts) and moving the wheel up, down, and
side-to-side. If there is virtually no movement or shift, the
wheel is centered by the hub.
SLIP-FIT
CLEARANCE
BETWEEN HUB
AND WHEEL
Figure 96.
To verify if the wheel is hub centric:
Remove the lug nuts (or bolts) and try to move
the wheel up/down and side/side on the hub.
If the wheel has no appreciable movement
around or about the centerline of the hub, it
should be considered hub centric.
A hub centric wheel will have very little (0.003 –
0.004”) clearance or a slip fit to the hub.
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