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Automotive Service Association
Hunter GSP 9700
Vibration Control System

"Road Test" The Wheel Before It's On The Vehicle
To Eliminate Vibration Problems

Hunter's Road Force Measurement™ System Solves Non-Balance Related Vibration Problems Before The Customer Leaves The Shop.

The GSP 9700 extends far beyond the traditional functions of a wheel balancer and "road tests" the wheel before it's on the vehicle to eliminate vibration problems and comebacks. Hunter's exclusive Road Force Measurement™ System utilizes a "road roller" to measure uniformity of the wheel and tire, simulating a road force test and verifying if the assembly is "round when rolling."

The GSP 9700 will automatically diagnose any vibration problems and provides easy-to-follow instructions on how to solve them - all without performing any extra steps or taking the wheel off the balancer. Now the service dealer can locate and eliminate virtually every cause of vibration relating to the tire and rim and offer customers 100% quality control.



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What is a GSP9700?

What Users Say
About The GSP9700

"Road test" the wheel to solve hidden vibration problems.

The GSP 9700 utilizes an exclusive "road roller" that applies up to 700 pounds (318 kg) against the tire assembly to detect non-balance related vibration.

The GSP 9700 uniquely identifies and locates:

  1. Tire uniformity problems caused by stiffer or weaker areas of the tire under load.

Tire uniformity is the amount of change in stiffness of the sidewall and footprint when load is placed against the tire. This is one cause of excessive radial force variation.

  1. Tire and/or rim runout.

Hunter's Road Force Measuring System simulates a road test to identify any vibration problems.

  1. Excessive balancer mounting error.

If the Road Force Measuring System detects a radial force variation problem, it will prompt the user to measure rim runout.

  1. Improper bead seating of tire to rim.

The GSP9700 then calculates the contribution of the tire to the problem and presents clear instruction on how to proceed.

1. Measures Tire Uniformity

The Road Force Measurement System quickly identifies radial force vibration previously measured only by industrial "tire uniformity graders" costing hundreds of thousands of dollars.

DIALS 2. Measures Lateral and Radial Rim Runout

The GSP 9700 measures lateral and radial rim runout without removing the tire from the rim and quickly indicates if runout is tire related. Runout can also be measured at the actual bead seat on a bare rim.

This feature eliminates time-consuming measurement of runout using dial indicators or "eyeballing" it after the customer returns with a complaint.


3. Detects Balancer Mounting Error

Mounting error can occur on any balancer; however, the GSP 9700 detects and automatically alerts the operator to excessive mounting error. This provides a more consistent balance and minimizes comebacks.


4. Aids Bead Seating

  • When mounting and inflating new tires, the tire bead may not reach its optimum seat on the rim due to rusted steel rims, lack of lubrication during mounting, or difficult mounting of low-profile tires.
  • In some cases, the GSP 9700 load roller produces enough force to seat the tire bead properly without road testing before balancing.

Solves Hidden Vibration Problems With OEM-Matching

The GSP 9700 OEM-Matching procedure duplicates the tire force variation measurement and rim runout low-spot matching method used exclusively by vehicle manufacturers to provide that "new car ride." The OEM-Matching procedure cancels tire force variation with rim runout. (This is not the same as balancer "matching" that merely minimizes weights required.)

The GSP 9700 indicates if the assembly can be OEM-Matched or if the tire or rim is out of spec and needs to be replaced.

Tires with marginal force variation can even be matched to other rims at a later date. (Exclusive Match Code feature)

Easily Chosen Balancing Procedures

Display shows weight types and placement selection.

  • Standard balance using clip-on weights.
  • Combination of clip-on and adhesive weights.
  • Hidden adhesive weights only. Infinite positioning (no "best guess").
  • Patch Balance: using weighted patches inside oversized off-road tire applications.

Automatic Double Dataset®Arms
(See Illustration)

Inner and Outer Dataset® Arms double as measuring tools for lateral and radial runout and speeds placement of clip-on or adhesive weights. Reduces possible errors by eliminating manual data entry.

Simply move Dataset arms to "touch" any chosen position for instant and accurate entry of data. (See Illustration)

Split Weight® Mode
(See Illustration)

Exclusive Split Weight® Mode feature splits the weight into two smaller weights providing the most accurate balance and reduced weight inventory.

  • No need to inventory large weights.
  • Multiple choices in case required weight is out of stock.
  • Avoid trim ring obstructions.

Servo Stop Wheel Positioning (patent pending)


Positions rim at Inner DATASET® Arm weight location for exact placement of adhesive weights.

Servo Stop Wheel Positioning constantly repositions wheel to seek desired weight location (TDC or BDC) and returns even if pushed away.

Quick-Thread™ Auto Clamping (patent pending)

  • With a double tap of the foot pedal the "intelligent" DC drive system activates motor-assisted wing nut spin on/off. Eliminates hand cranking of the wing nut to "take up" the unused spindle threads.
  • Strongest wing nut in the industry is just as fast to use as less durable quick clamp designs.


Spindle-Lok™ Data Entry

  • Foot pedal locks spindle for easier tightening and loosening of wing nut.
  • Tapping the foot brake activates entry and storage of wheel data plus Quick-Thread™ feature.



(Some dimensions and capacities may vary depending on tire and wheel configuration.)

Power Requirements: 230V, 20 amp, 50/60-Hz, 1-ph, NEMA L6-20P

Air Supply Requirements: 120 +/- 40 psi (8 +/- 2.7 bar)

Roller Force: up to700 lbs. (318 kg)


Rim Width: 1.5 in. (50 mm) to 20 in. (520 mm)
Rim Diameter: 10 in. (272 mm) to 24.5 in. (640 mm)
ALU: 7.5 in. (190 mm) to 41 in. (999 mm)
Maximum Tire Diameter: 44 in. (1117 mm)
Maximum Tire Width: 20 in. (520 mm)
Maximum Tire Weight: 150 lbs. (68 kg)

Radial & Lateral Runout Accuracy: .002 in. (0.05 mm)

Radial Force Measurement Accuracy: 2 lbs. (1.0 kg)

Imbalance Resolution: +/- 0.01 oz. or 0.5 gms.

Placement Accuracy: 512 positions, +/- .35°

Balancing Speed: variable rpm, direction and torque

Motor: "Intelligent" DC motor drive

Shipping Weight: 675 lbs. (307 kg)


Some information and photographs on this page courtesy of Hunter Engineering.