[DJ]

You seem to contradict yourself with these statements.

If a wheel has no runout, then it cannot compensate for any force variation in the tire. If a wheel has a little runout, then that runout can be used to compensate for a little force variation in the tire. If a wheel has a bit more runout, then that bit more runout can be used to compensate for a bit more force variation in the tire. And so on ...

Such compensation is not necessarily "perfect", because the wheel runout doesn't necessarily match the radial force variation. Such compensation reduces the net radial force variation of the assembly, the result of which is a tire/wheel assembly which rolls more smoothly down the road.

My Toyota OEM alloy wheels have only a very small amount of runout, about 0.003" or less, so they can compensate for only a very small amount of radial force variation in the tires. My Michelins are very good, so they don't need much compensation.

All vehicle assembly plants use tire mounting machines which use whatever wheel runout it present to compensate for whatever radial force variation is present in the tire mounted to that wheel. Again, such compensation is not perfect, but the net result is a tire/wheel assembly which rolls more smoothly down the road.

So, where is the contradiction?

My point it that a person who relies on a piece of equipment will not have the proper experience and skill to understand what he is doing.

I rely on equipment and I have the proper experience and skill to understand what I am doing.

I can get the exact same results, a smooth ride using either a traditional spin balancer or the gsp. There are also a lot of other things that I can notice during a balance that if I were not skilled, relying on a machine would not help.

So, please enlighten us. I have no doubt whatever that skill is a very good and desirable thing, but my curiousity is deeply aroused as to how you actually apply it.

If the problem is caused by a lot of radial force variation in the tire, yet the tire has no visual defects and appears to have little or no runout, how do you detect the cause of the problem and fix it using a conventional spin balancer, which cannot measure the radial force variation in the tire?

I have seen numerous tires that have no visual defects and have virtually no measurable runout when rotated without load on a balancer or a vehicle, but these same tires have a great deal of radial force variation when rotated in a loaded condition, such as on a GSP9700 or on a vehicle on the ground. If you can't measure it and can't see it, such as happens with such tires on a conventional spin balancer, how do you fix the problem?

Hunter markets this to low volume shops as a way to cure problems. They have problems balancing tires because they do not do very many and probably haven't had a lot of training. Most mechanics wouldn't give tire balancing a second thought. That is where they run into trouble.

Who found this out, and how did they find this out?

I would never seek out a shop just because they had a piece of equipment. I absolutely wouldn't pay extra to have my tires balanced by it.

Many people do and achieve very satisfactory results thereby. Would you have us believe that it is wrong or misguided for them to do so?