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TIRE CARE
MATCH MOUNTING
Mounting Procedures
For the proper mounting of Yokohama tires, be sure to observe some
basic precautions:
- Wheel is securely seated on the hub face.
- All lugs have proper torque.
- There is no buildup of dirt between the hub and wheel.
- The wheel is not bent.
- Both tire beads are securely seated on the rim.
Custom or Alloy Wheels
While custom or alloy wheels require an increased level of care over
steel wheels, it is vitally important that each customer receives the
highest level of service. There are several key points to note when
mounting Yokohama tires. Following these basic precautions not only
yields consistent results, but satisfied customers—and that translates
into return business and new referrals.
Avoid scratching or bending alloy wheels during
installation
These wheels are manufactured with extremely soft metals with a greater
sensitivity to scratching and distortion under pressure. Modern tire machines
apply equal pressure to both top and bottom beads with no pressure on the wheel
itself. A pad on the base of the mounting machine protects chrome-plated,
painted or machined wheels from scratches and damage.
During the mounting process, proper lubrication
is a must
Lubricate both top and bottom beads with an approved tire lubricant.
If the beads do not seat at 40 psi, break the entire assembly down and
re-lubricate the bead areas.
Observe match-mounting procedures
Proper tire and wheel assembly balancing is important from a vehicle
safety standpoint. In high-speed driving, improperly balanced tire/wheel
assemblies will cause a vehicle to lose stability and not operate in a safe
and comfortable manner. Improperly balanced tire/wheel assemblies also cause
abnormal treadwear patterns.
To facilitate proper balancing, Yokohama places red and yellow marks on
the sidewalls of its tires to enable the best possible match-mounting of
the tire/wheel assembly. There are two methods of match-mounting Yokohama
tires to wheel assemblies using these red or yellow marks:
- Uniformity (red mark)
- Weight (yellow mark)
Warning: Improper mounting, underinflation, overloading or tire damage may
result in tire failure, which may lead to serious injury. Tire and rim sizes
must correspond for proper fit and application. Never exceed 40 psi to seat
beads.
Warning: Tire changing can be dangerous, and should be done only by trained
persons using proper tools and procedures established by the Rubber
Manufacturers Association. Failure to comply with proper procedures may
result in incorrect positioning of the tire, tube or wheel assembly,
causing the assembly to burst with explosive force sufficient to cause
serious physical injury or death. Never mount or use damaged tires, tubes
or wheel assemblies.
Uniformity Method
When performing uniformity match-mounting, the red mark on the tire,
indicating the point of maximum radial force variation, should be aligned
with the wheel assembly's point of minimum radial run-out, which is generally
indicated by a colored dot or a notch somewhere on the wheel assembly
(consult manufacturer for details). Radial force variation is the fluctuation
in the force that appears in the rotating axis of a tire when a specific load
is applied and the tire rotated at a specific speed. It is necessary to
minimize radial force variation to ensure trouble-free installation and
operation. Not all wheel assemblies indicate the point of minimum radial
run-out, rendering uniformity match-mounting sometimes impossible. If the
point of minimum radial run-out is not indicated on a wheel assembly, the
weight method of match-mounting should be used instead.
Weight Method
When performing weight match-mounting, the yellow mark on the tire,
indicating the point of lightest weight, should be aligned with the valve
stem on the wheel assembly, which represents the heaviest weight point of
the wheel assembly. After match-mounting by either of the above methods,
the tire/wheel assembly can be balanced.
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