Vibration Problems

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Vibration Problems
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Road Force Measurement
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Vibration results when tire stiffness is not
uniform.
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What you need to know about Wheel Balance Wheel
Vibration Control
At 60 miles per hour, an average size tire
rotates 850 time per minute. At this speed,
slight variations in balance, sidewall stiffness
or roundness can cause the wheel to literally
slam into the pavement 14 times a second. The
ultra-sensitive road feel of today's vehicles
gives drivers a hands-on detection of vibration,
a warning of potential problems. Unchecked,
excessive wheel vibration can result in expensive
damages and unsafe driving conditions such as
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Wheels Out of Balance
Static wheel balance measures only "up and down."
Dynamic wheel balance also measures from "side to
side."
Dynamic wheel balancing uses two weight planes.
This eliminates "up-and-down" and "side-to-side"
imbalance. Dynamic, two plane wheel balance
should always be requested, even on custom wheels
when hidden weights are required.
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Wheel Force Variation
A perfectly balanced tire can still vibrate due
to Force Variation.
An out of round tire (runout) causes wheel
vibration.
Wheel Force Variation is most frequently due to
wheel runout or uneven tread or sidewall
stiffness in the tire. Runout is when a tire or
rim is out of round when rolling frequent causes
are a bent rim or uneven tire wear.
A stiff spot hitting the pavement causes
vibration.
Uneven tread or sidewall stiffness can be found
in new or worn tires. Tires by design are never
uniformly flexible throughout nor are they
perfectly round. And no two tires are exactly
alike in these characteristics.
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How Wheel Force Variation is Corrected
OEM Match Mounting matches a high point or stiff
spot on a tire...
1. Match mounting a tire and rim by matching the
high point or stiff spot in the tire with the
lowest spot in the rim, can make the wheel "round
when rolling."
2. In some cases a wheel is so out of round it
should be replaced.
with the low spot on the rim, for maximum
roundness.
3. In some cases a tire with excessive Force
Variation is defective.
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Tire Pressure and Wheel Alignment
Steering and Suspension Components
Other Hidden Causes of Wheel Vibration
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GSP9700's Inflation Station provides proper
inflation pressure for accurate testing.
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Step 2 Measure Rim Runout
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Rim Runout Measurements
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Step 3 ForceMatching and Balance
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Matching the stiff or high spot on the tire with
the low spot on the rim cancels vibration caused
by radial force variation and provides the
smoothest ride.
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Benefits of the GSP9700's Diagnostic Repair
Capability
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Features That Make Expert Balancing Easier and
Faster
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Features That Make Expert Balancing Easier and
Faster
Prove Wheel Centering
Infinite Weight Positioning
Quickly Locate Weights
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26-inch tire and wheel assembly shown above
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Specifications
Roller Force up to 1,400 lbs. (635 kg)
CapacityRim Width 1.5 in. (50 mm) to 20 in.
(520mm) Rim Diameter 10 in. (272 mm) to 24.5 in.
(640 mm) ALU 7.5 in. (190 mm) to 41 in. (999
mm) Maximum Tire Diameter 40 in. (1016
mm) Maximum Tire Width 20 in. (520 mm) Maximum
Tire Weight 175 lbs. (80 kg)
Radial Lateral Runout Accuracy .002 in. (0.05
mm)
Radial Force Measurement Accuracy 2 lbs., 10N
(1.0 kg)
Imbalance Resolution /- 0.01 oz. or 0.5 gm
Placement Accuracy 512 positions, /- .35
Balancing Speed variable rpm, direction and
torque
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Comprehensive Wheel Service
Thanks to Hunter Engineering Company