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Random Products - Tires
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Marauder Tire Choices - Tire Matrix
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Description:
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The first law of automotive vibration says that ALL vibrations on cars are caused by things that are spinning.
Roadforce balancer. Sounds really high tech, right? Well it's not. It's a tire balancer that has a roadforce measuring attachment on it, and programming for the computer to use it. The new machine from Hunter now has a drum for the tire to roll against at slow speed. The tech moves it up against the tire and locks it in place and turns on the machine which then measures the resistance of the slow roll it induces to detect any hard spots in the tire. If there are any, the tire must be discarded! It will never be alright and there is no way to balance out the hard spot. This is a relatively rare condition, especially with these high dollar tires.
Out-of-round tire/wheel assembly. Ususally this is felt at a certain speed, 55-65 mph on most passenger car tires, provided they're properly balanced. Before it, smooth as glass, after it, still nothing. But at that certain speed, a steady continuous vibration (with one out-of-round tire). I've never had the occasion to see this in a low profile tire, but I suppose the speed for this type could be higher.
Vectoring is where the high spot of the tire is matched (aka, vectored) to the low spot of the rim. (If a tire or rim is out of specs, they must be replaced.) The new Hunter machine tells the tech where the high and low spots are, but he must dismount and remount the tire to match them up. More work. I always used to just find the low spot of the rim before I put the tire on and used the blue dot indication for the high spot of the tire (a DOT requirement) to vector mount. If your tires are not vectored properly, a R/F balancer will fix your problem, as well as check for a bad tire.
Harmonic vibration. This happens when something vibrates, perhaps not noticeably, at a frequency that causes some other component, like a steering wheel or column to vibrate noticeably, like a tuning fork. The steering wheel has a harmonic "sound", a specific frequency, that if slighly induced by a matching frequency, like from a tire or the engine, will cause it to "wake up" and vibrate. Adjusting the rack pre-load would change it's frequency as well, but it still would have to be something else (that's spinning) causing the "seed" vibration. That this vibration you have "comes and goes" tells me you have two things, each vibrating a little that converge at times adding up to a lot of vibration that comes and goes. This is called a harmonic convergence.
I cut my mechanics teeth on front-end alignments and tires and I have never seen alignments or steering components cause vibrations of any kind. Vibrations are always caused by round things that spin fast. Duh! Also, a tire balancer that is off it's calibration won't balance the tire, if the guy using it is using it properly. He should put the weights on and spin it again to check it. If the machine is off, it'll tell him that tire needs more weights, ad infinitum, and he'll know something's wrong with the machine.
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tire vibration
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