exx1976

I have 20x10 Toxic wheels on the back of my car with 285/30/20 Nitto 555's. The tire place could only get it balanced to 0.00 on the inside and 0.25 on the outside, and they claimed I wouldn't feel it. Yesterday I took her out to stretch her legs, and when I got up to about 85-90, the rear end started wobbling a little bit.

So I called tie tire place back up, and he said he would throw a bag of Equal in it. I checked the company's website to learn about the product, and apparently it's some type of self-balancing sand-ish material that is free-floating inside the tire. When I called them, they told me that it was only designed for truck use, and that it is not recommended for passenger car use. But the tire shop owner said he's used it in his race cars and on several other cars with great success... ??

I'm thinking I should take this wheel/tire to a place to have it road-force balanced before I go letting them put anything inside the tire.

Anyone have any input??

99flhr

Consider indexing the tire/rim combo to minimize runout (assuming that it exists)
1.Mount on the balancer and determine the high spot of radial runout. Mark it
2.Now, partially dismount the tire and rotate 180 degrees.
3.Repeat step one, if the high spot remains at your mark, the tire is the main offender. If the high spot is opposite your mark it`s the wheel. If it "goes away" you`re golden

To do this really "right", it`s best to use a dial indicator, good tire shops have one with a tiny wheel on the stylus which allows accurate measurements

Frequently neither the wheel or the tire is "bad". But by chance both high spots are aligned together making it difficult to achieve smooth running. (esp at 90 !)

Further experimentation with turns of 90 degrees each, can allow you to find the ideal placement.

The above steps also apply to lateral runout. Watch the tire at full speed on the balancer and determine which is more pronounced, Start there.

EDIT: before you try any of the above, use a torque wrench and verify lug nut tightness. (approx 100 lb/ft ) and psi.
Repeat your banzai test drive

exx1976

I understand the purpose of making sure you check the lugs with a torque wrench as far as them not falling off or coming loose, but what effect would that have on vibration?

99flhr

Not having the lugs properlyandEVENLY tight can induce vibration, although this is morecommon in the front. ALL mag wheels should always be rechecked after 25-50 miles of running.

AshTang

Are there any ink markings left on your sidewalls? The high point may already be marked.

howarmat

https://mustangforums.com/showProfile.asp?memid=17179

talk to stoenr....he has been working in the tire biz for 18+ yrs i think