I've never seen one balance for a particular speed, but they pick out all kinds of stuff. They use a wheel that applies pressure against the tread so that the balancer can read differences in that pressure, as in out of round, high spot, low spot, bent rim, etc. I've never seen one turn fast to do this. Most that I've seen turn at about 1RPM for a turn or two to get the measurements. Some shops, even with a road force balancer, will eyeball the results and say "yep that'* not too bad, it'll be fine" and send the car on its way, so be sure to ask for results.

Also, some shops don't actually look for runout or rim defects. I've seen some pass a wheel/tire combination that is centrifugally balanced, but you can see the that the rim is bent or tire is out of round from 50 feet away.

I have also noticed that shops aligning a vehicle to the specs fo that vehicle.. is not necessarily an assumed thing apparently. So suspicious readings or claims that also are strange like "cant be brought lower unless ]huge money item] is done"

Yep.

Sometimes it'* true though. Had my Saturn Outlook aligned a couple of years ago and they told me they couldn't get the camber right without installing cam bolts. This is because GM hadn't included a way to adjust camber on these. I hadn't heard of this so at first I cried shenanigans. Too bad I didn't have my broom with me. Then I looked at the car and sure enough it was negative cambered a bit, I just hadn't noticed. I looked up cam bolts and found that they aren't witchcraft and tomfoolery, but rather they are a real thing. Gave them the go ahead and they adjusted everything out to two decimal places and it looks nice and square. They do camber inward on compression, so I suspect they camber inward as the springs sag, which I think they do a little. Understandable at around 200,000 miles.

Back to the wheel issue: The factory rims on my 1997 LeSabre were an option for a couple of years into the 2000-2006 platform with the only change being the 14mm taller tires. For a wheel/tire vibration this would increase the speed that the vibration is felt by about 2.2%, so essentially the same speed. The vehicle weight increased by about 4.6% between the platforms so weight wouldn't play into this very much either. I'm curious what the road force results are on this.

strange on that outlook. most people dont realize that while the GM C/G/H platforms (same suspension after 98 dam near minus small changes) Has no camber adjustment but the proper way to do it is with a file. you make

You vs the guy she told you not to worry about (next one bottom)


so while you can cambolt, its a good idea to slot the strut. lucerne struts, which can be swapped with knuckles etc a to retrofit, have slots on them factory.