GSP9700 Series Road Force Measurement System Operation 9. Glossary 139
9. Glossary
9.1 Balancing Terms
Amplitude (Magnitude)
The amount of force or the intensity of the vibration.
Back Coning
When the wheel requires the cone to center the wheel on the balancer’s shaft from the
backside, primarily due to the chamfer of the wheel. Also referred to as Back-Cone
Mounting.
Backspacing
The distance measured from the mounting face to the back edge of the wheel.
BDC
The abbreviation for bottom dead center also referred to as 6 o’clock.
Bead seating
The process of seating the tire to the rim bead seats. Bead seating preferably occurs just
after the tire and rim have been assembled, but may gradually change and optimize over
a longer period. If loaded with the GSP9700 load roller or driven, the position of the bead
may optimize or always remain seated improperly, unless the tire is demounted,
lubricated, and remounted. However, the load force and its’ relatively short duration will
not necessarily solve defective mounting of the tire bead seat to the rim seat.
Bolt Pattern Circle
The diameter of an imaginary circle drawn through the center of each lughole, and
virtually always on the same centerline as the hub bore of the wheel.
Computerized Vibration Analyzer
A device used to determine the frequency of the vibration by isolating the vibrations with
the greatest magnitude.
Cycle
One complete disturbance.
Dampen
To decrease the magnitude of a vibration or sound.
Dampers
Used to reduce the magnitude of a given vibration. Rubber is commonly used to isolate
and dampen vibrations.
Dataset
®
The inner and outer electronic arms on the GSP9700. By positioning the Dataset arms
and entering data using the foot pedal, rim dimensions can be recorded for balancing.
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