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. 
Transference Path 
The object(s) that transfers the frequency. 
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. 
Wheel Diameter 
Dimension measured on the inside of the rim at the bead seats. 
Wheel Offset 
The measured distance between the mounting face of the wheel and the centerline of the 
rim.
Wheel Width 
Dimension measured on the inside of the rim between the bead seats. 
GSP9720JLR Wheel Balancer Operation Instructions  Glossary 
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