rip'd this from a tundra forum. pretty much sums it up.
I examined the site shown below as Toyota Balancing Problems (
http://forums.vmag.com/suv4run0499/messages/3295.html). There is a misconception there that is discussed at some length. To quote:
"Toyota does have a big problem with making the wheels round. Now matter how well they are balanced, the truck will not ride smooth if the wheels are out of round. The only way to fix that kind of wheel problem is to replace the wheels."
I have nine Toyota alloy wheels on my Tundra and Sequioa. One is the Sequioa spare, which has not been on the road yet. The eight in normal use, I have "force matched" on the Hunter GSP9700. This machines measures the radial and axial runout of the wheels at the mounting surface of the tire. The maximum runout I measured is 0.003". That's THREE THOUSANDTHS of an inch. That, friends, is ROUND for a wheel.
But, I digress. It is worth understanding just what the GSP9700 does, which just might change your thinking on round wheels.
The GSP9700 models the tire mounting surface on the wheel as a "hoop" that is round, but possibly off-center relative to the mounting hole in the center (or the center of the Haweka lug adapter). It models the loaded rolling surface of the tire as a "hoop" that is round, but possibly off-center relative to the tire bead. It allows you to mark the "phase" of each, such that the tire can be busted loose from the rim, rotated on the rim to match the marks, then re-inflated. This puts the "high spot" of the tire force "hoop" matched with the "low spot" of the wheel "hoop". The net road force variation is minimized that way. It's not necessarily zero, but it's minimized.
What's the catch? If the wheel has NO runout, then the wheel "hoop" is centered, and the road force variation caused by the tire cannot be improved. So, a LITTLE bit if radial runout is actually a good thing IF you use the GSP9700 to force match the tire with the wheel. But, if you don't use the GSP9700 and you have a really good tire, it actually CAUSES road force variation.
The bottom line? Use the GSP9700. It will make the wheel/tire combination as good as it can be, and it will tell you if it's not good enough, so you can find and fix the cause.