AFS Wheels

Hunter Balancing

Hunter GSP 9700

In this section we will give you a bit more information on the Hunter GSP 9700 Vibration Control System and why we believe it to be the very best method you can use to balance your tires.

The NEW Hunter GSP9700 extends far beyond traditional functions of a wheel balancer. Balancing is only a small fraction of its capabilities. The GSP9700 simulates a "road test" without any extra work. The unique "road roller" measures uniformity of the wheel and tire under load, verifying if the assembly is round when rolling. Computer diagnosis and adjustment insures a "new car ride feel" never before available except for use by industrial OE manufacturers paying hundreds of thousands of dollars.

The GSP9700 is a Vibration Control System. It allows us to eliminate virtually every variable causing vibration in relation to the tire and rim, except vehicle related problems. Wheel Force Variation: A perfectly balanced tire can still vibrate due to Force Variation. Wheel Force Variation is most frequently due to wheel runout or uneven tread or sidewall stiffness in the tire. Runout is when a tire or rim is out of round when rolling. Frequent causes are a bent rim or uneven tire wear. Uneven tread or sidewall stiffness can be found in NEW or worn tires. Tires by design are never uniformly flexible throughout nor are they perfectly round. And no two tires are exactly alike in these characteristics.

Force Variation (Tire Uniformity). Radial force variation is the amount of change in stiffness of the sidewall and footprint when a load is placed against the tire. To understand the effects of radial force variation, imagine the tire as a collection of springs between the rim and the tire tread. If the "springs" are not of uniform stiffness, a varied force is exerted on the axle as the tire rotates and flexes. This creates a vibration in the vehicle. There are specifications and acceptable limits from tire manufacturers. Up until now, force variation has been measured only by OEM's in an industrial setting using equipment in the range of half a million dollars. For example, a tire and rim could be perfectly round when measured with a dial indicator (free runout) and the wheel will still vibrate when driven due to excessive force variation.

Many tires on the market today have a "paint dot" or mark on the tire that indicates either the high side or low side of force variation. Many have attempted to solve vibration problems by blindly' lining up the dot' with the valve stem. The operator assumes the "dot" is the high point of radial force of the tire and the wheel valve stem hole is the low point of runout of the rim. Unfortunately this is not always true. Many tires are not marked and many wheel manufacturers do not use the valve stem as the low point. Other OEM's use the marks to indicate high points instead of low points!

The GSP9700 eliminates any guesswork.
The locations of runout and tire force are quickly located and measured. At 60 miles per hour an average size tire rotates 850 times per minute. (*Rotation for smaller tires is slightly faster; for larger tires it is slightly slower.) At this speed slight variations in balance, sidewall stiffness or roundness can cause the wheel to literally slam into the pavement 14 times a second. When getting new wheels and tires for your vehicle it is so important that they are balanced properly with the latest equipment!

Why spend all that money for the new wheels and/or tires and then take a shortcut on the balancing. Your safety, comfort and quality of the ride are on the line.

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