18 •
Important: Always read and follow the operating instructions.
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To avoid personal injury or finish damage to
components only tire technicians with expe-
rience and training on custom wheels
should attempt to service expensive custom
alloy or aluminum wheels, high-perform-
ance low-profile tires and EMT/run-flat tires.
Many tires/wheels have pressure sensor
devices that are manufactured by different
companies, there are no standards on type
or mounting; therefore, follow the instruc-
tions that apply to the sensor being serviced.
For further information on these devices,
contact the individual sensor manufacturer.
Pre-Operation Notes:
• Ensure all weights have been removed.
• Assistance will be required on wide and large diam-
eter wheels.
• Clamp wheel from the outside.
• Use ample lubricant for mounting and demounting
• Always review wheel nicks and/or scratches with
the owner before servicing.
Performance Tires & Wheels • Demounting
Follow these instructions for performance type tires
and wheels, including run-flat tires and their associated
wheels, and asymmetrical hump wheels.
1.
Remove the valve core and completely deflate the
tire. On many performance wheels a valve type sensor
may be inside of the rim. These devices are expensive
and should be serviced with care. After deflating the
tire, loosen and remove the retaining nut and then tap
lightly with a hammer to allow the valve sensor to fall
inside the tire before further service work (figure 24).
Figure 24 - Rim with a Valve Type Sensor (Tire Removed for
Clarity)
2.
Some wheels have a low-pressure sensor/trans-
mitter strapped to the wheel. This is especially true on
older run-flat tire/wheel systems. To avoid damaging
the sensor, always loosen the top bead with the valve
stem at the 2 o’clock position first, to determine sen-
sor location. Then loosen the bottom bead and the
remaining circumference of the beads as necessary at
a location that will not damage the sensor. (Figure 25).
Figure 25 - Wheel with Strapped on Low Pressure
Sensor/Transmitter
3.
Wheels with an asymmetrical hump have a larger
"ledge" type hump around the wheel except at the
valve hole making them more difficult to mount and
demount and bead loosen (Figure 26).
Figure 26 - Asymmetrical Hump Wheel
4.
Pull the bead loosener shoe away from the
machine and roll the tire in position with the valve stem
in the 2 o’clock position (above the bead loosener
shoe). Always loosen the bead on the narrow/mount-
ing side of the wheel first (figures 2 and 27).
Figure 27 - Position Tire for Bead Loosening
CAUTION
WARNING
Smooth
Hump At
Valve Hole
Ledge
Hump Rest
of Wheel
Valve Stem
Sensor
Valve Stem
