How to Solve Wheel Vibration Problems using the Hunter GSP9700


How Can The Tire and Wheel Be Fixed If Road Force Measurement Is Beyond Limit?


ForceMatching® Codes

This feature is for special cases where a tire will not match with the current wheel, but is likely to match with other wheels later. When necessary, the tire or rim may need to be substituted to reduce the assembly's amount of road force.

In the example shown below, use the ForceMatching codes on the graphic display to find a suitable match.

The ForceMatching code for the wheel is 2.

The ForceMatching code for the tire is 30.

These numbers are GSP9700 specific and indicate the amount of radial runout or force variation in comparison to each other, and have no commonly assigned value such as inches or lbs.

The ability to reduce road force is more likely when the ForceMatching codes are similar in amount.

In the example shown above, the tire could be marked with a 30 and placed back on the rack until a wheel with a similar ForceMatching code is located. Another tire can then be selected to closer match the ForceMatching code of the wheel.


MatchMaker is a guided procedure which cross-matches tires and rims as a set, rather than limiting the matching success to a particular tire and wheel.

This procedure can be helpful for:

  Guiding an inexperienced operator through every individual step.
  Utilizing high RFV tires with multiple wheels from the same vehicle.
  Wheels with soft clear coat designs.
  Mounting new tires on rims that have external bead seat obstruction.

Dial Indicator Gauges

The “Show Dial Indicators” key may be selected from the “Current Runout & Force Variation” screen to display on-screen dial indicator gauges. Each gauge displays the runout (actual arm movement) encountered at that location. This data is also displayed as the total indicated reading (T.I.R.) data on the runout plot screens. If there is only green showing in the span of the gauge, T.I.R. runout is acceptable. If green and yellow appear on the span of the gauge, T.I.R. runout is marginal. If any red appears on the span of the gauge, T.I.R. runout has been exceeded and may prompt an informative statement to appear in the Diagnosis Box concerning the exceeded limit. The dial indicator located directly above the tire tread is the loaded runout of the assembly as taken by the load roller. As the wheel assembly is rotated on the spindle, the dial indictor gauges will change to display current information for each dial indicator gauge position.

“Hide Dial Indicators” can be selected to remove the dial indicator gauges from the screen. Rim runout and force variation will still be graphically depicted on the screen.

Lateral/Radial Rim High Spot Indicators

The “Show Lateral High Spot(s)” and “Show Radial High Spot(s)” softkeys are available to select a graphical depiction of the exact radial (blue indicators) or lateral (orange indicators) first harmonic runout high spot locations. The high spots indicated are the high spots of the 1st harmonic NOT the T.I.R. runout high spots. The lateral/radial high spots correspond to the lateral and radial 1st harmonic rim runout amounts on the left side of “Current Runout and Force Variation”screen. 180° from the rim matching mark is a green indicator that will appear between the rim lips to identify the rim average 1st harmonic high spot.

Details/Diagnosis Explanation Key

“Show Details” can be selected to view detailed data about measurements taken and the limits for each measurement.

When limits that are not first harmonic are exceeded, the “Show Details” key will be replaced with an “Explain Diagnosis” key which can be selected to view information on exceeded limits for the rim or tire.

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