to scribe two aligning marks with a marker or chalk on the hub/shaft assembly and
the rim. This will allow you to align the rim and hub/shaft assembly back together
after mounting the tire on the rim. After spinning with the tire mounted and the load
roller enabled, press “Apply Last Rim Data” from “Balance” primary screen. This will
recall the bare rim runout data from the previous rim measurement.
Forcematching Using Previous Road Force® Measurement
This procedure should be used if a bare rim measurement will be taken for rim runout
data after the Road Force® Measurement has been obtained, such as when the rim
runout data cannot be measured from the outside surface of the rim and the Road
Force® Measurement has exceeded the limit.
With chalk or a marker, draw two aligning marks on the hub/shaft assembly and the
rim.
Mark the tire at the location of the valve stem and label the line “VS.”
Remove the assembly from the balancer.
Remove the tire from the rim and remount the bare rim onto the balancer, being
careful to realign the rim and hub/shaft assembly marks.
Take the bare rim measurement. Refer to “Rim Runout Measurement (Bare Rim),”
page 65.
Press “Apply Last Tire Data” to recall the previous Road Force® Measurement.
Mark the rim at the high spot of tire road force and label the mark “FV.”
Mark the rim at the low spot of rim runout and label the mark “RR.”
Lay the tire down on the floor.
Remove the rim from the balancer and set it on top of the tire with the valve stem
(“VS”) mark on the tire aligned to the valve stem.
With the valve stem and valve stem (“VS”) mark aligned, transfer the road force
(“FV”) mark from the rim to the tire and label it “FV.”
Mount the tire on the rim with the road force (“FV”) mark on the tire and rim runout
(“RR”) mark on the rim aligned.
Using ForceMatch Codes Feature
When a tire or rim matching mark is placed at TDC, the corresponding ForceMatch
Code is displayed. The code numbers can be recorded on the tire/wheel for optimal
matching procedures. Matching a tire and rim with similar match code numbers may
decrease the first harmonic vibration substantially.
Matching Tire/Wheel Sets:
A set of tires and rims may be matched to each other for optimum vibration reduction.
The tire and rim with the highest match code should be paired, then tire and rim with
the second highest match code should be paired, continuing the pattern for the entire
set.
Matching Inventory:
Shops with inventory can label existing stock with ForceMatch Codes and optimally
match assemblies prior to sale to reduce Forcematching® mounting time, reduce tire
vibration, and increase customer satisfaction. The tire and rim match code can be
labeled and the high/low spot marked and inventoried for later use. Tires and rims
can then be matched to each other for optimal ride performance. A marginal rim or
tire can be put into stock and later be matched to a rim/tire with a similar ForceMatch
Code for a minimal first harmonic vibration.
86
Road Force® Measurement Procedures GSP9720JLR Wheel Balancer Operation Instructions
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