GLOSSARY 77
Spindle-Lok®
A feature that locks the spindle in place by depressing the
foot pedal.
Split Weight®
Feature designed to reduce single heavy amounts of
weight by dispersing the corrective weight over a wider
area.
Static Balance
A procedure that balances the wheel assembly using only
a single weight plane so that up and down imbalance is
eliminated.
StraightTrak
Balancer feature which helps designate where tires
should be installed on a vehicle for optimum ride and
handling.
TDC
An abbreviation for top dead center. Also referred to as
12 o’clock.
Torque Sensitive Vibration
The vibration occurs when accelerating, decelerating, or
applying the throttle.
Total Indicated Reading (T.I.R.)
Data measurements taken by the load roller (measured
in lbs. or kg) or Dataset® Arms (measured in inches or
millimeters) representing the actual runout measured.
The T.I.R. data represents the difference in value
between the highest and lowest value measured.
TruWeight™
A method calculating and displaying exact placement of
balance weights on a wheel.
Vibration
A shaking or trembling, which may be heard or felt.
Weightsaver® Feature
Weightsaver® is the percentage of maximum shimmy
allowed. The larger the percentage, the greater the
weight savings.
Resonance
The point where a vibrating component’s frequency
matches the natural frequency of another component.
Responding Component
The noticeable component that is vibrating.
Road Force®
A change in the force between the wheel and the axle
while rotating under a load. Discrepancy in road force
can cause a vibration although the tire and rim may be
perfectly round and the tire is balanced.
Road Force® Measurement
A measurement of the wheel assembly as would be found
from an actual road test of a vehicle. The Road Force
Touch® is equipped with a load roller to take the Road
Force® Measurement. The load roller places up to 1400
pounds of force on the spinning tire, and automatically
measures the effects of loaded runout and tire stiffness
to emulate tire/wheel assembly force variation. Loaded
runout of rim and tire stiffness calculated equals the
Road Force® Measurement.
Road Force® Variation
A change in force exerted on the axle by the tire/
wheel assembly while rotating under load. Units of
measurement are in pounds, Newton’s, etc.
Runout
The side-to-side movement of a wheel as measured from
its true center.
Servo-Stop
The ability to locate varying positions of the tire/
wheel assemblies and hold the position in place while
correctional weights or OE-Matching marks are applied.
SmartWeight® Balancing Technology
SmartWeight measures the forces placed on a wheel and
balances in an effort to reduce those forces, thus saving
weight, time, and money.
Source Component
A component causing another object to vibrate, such as a
tire/wheel assembly.
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