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unkledaddy's avatar
unkledaddy
Explorer
Dec 27, 2012

TIRE BALANCING HELP NEEDED

I just purchased a pair of Goodyear G670(295-80R22.5)tires for the front of my rig.

There was a problem with a slight vibration at 45-55 MPH. The dealer
then spin-balanced the tires with them on the coach, but there's still a vibration. The dealer then said that he had heard a roaring
in the wheel bearings on the driver's side and it could be the problem. At that point I said to him that there was over 12ozs
of wheel weights on that rim and I thought that excessive. He replied
that 8-14ozs is acceptable for my tire/rim combo. So I brought the rig
home, replaced and properly torqued the two front wheel bearings. It still has the vibration.

I have searched repeatedly for information on excessive wheel balancing weights, as well as contacting Goodyear, and still have
no idea what is considered excessive. Goodyear claims to have no information and referred me to a local commercial tire shop that could
look at the tire and put it on a balancing machine that is calibrated weekly and would indicate how much balance weight is needed. Really?

Does anyone here on the board have a link to a webpage with the information I'm looking for?
Class A

29 Replies

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  • gsf35099's avatar
    gsf35099
    Explorer
    Dec 27, 2012
    I just spoke to my tire shop buddy and he said 12-14 ounces of weight is not uncommon on these big tires. He also said it takes an experienced tech to balance these big tires on the rigs. If the vibration was not there before the tire change, he suggested to remove the weights and see if the vibration is gone. He highly recommended the equalizing powder bags. Hope this helps.
  • gsf35099's avatar
    gsf35099
    Explorer
    Dec 27, 2012
    My buddy owns a tire shop and used to drive semi's. He uses the balancing substance (in a bag) that is thrown inside the tire before mounting. You then have to drive 50 miles or so (bag breaks open) to get the tires to balance and run smoothly. I have only replaced one set on this RV with these big tires, but it did a great job. He told me that he had been using this technique for 10+ years.
  • powderman426's avatar
    powderman426
    Explorer
    Dec 27, 2012
    rgatijnet1 wrote:
    Have the tires deflated and turned 180 degrees on the rim. Sometimes this is all it takes to balance the tires without a lot of weight.
    There was a time when a specific spot on the new rubber tires was to be aligned with the valve stem. That is not as important now but some tires do still need to be shifted on the rim to balance better.


    I somewhat agree. Sometimes its 180 degrees, other times somewhere inbetween. If you can't find a spot where its close, have them balance just the rim. If the rim is close then its a bad tire.
  • Tom_N's avatar
    Tom_N
    Explorer
    Dec 27, 2012
    I see you have Goodyear but....

    I have never had 22.5 Michelins balanced. Never had any vibration. I'm having 6 new XRVs installed tomorrow and those will not be balanced.

    As long as the tire is mounted correctly on the rim you should have no out of balance.

    My 235/80R22.5 only make 556 revolutions per mile which is slow rotation.

    I suggest having you Goodyears remounted according the the diagram below.

    -Tom

  • K_Charles's avatar
    K_Charles
    Explorer
    Dec 27, 2012
    I think I remember a long time age we were told 1% was OK so if the wheel (tire and rim) weigh 50 lb (800 oz) then 8 oz of weight is OK. As said above, turn the tire around and try again.
  • rgatijnet1's avatar
    rgatijnet1
    Explorer III
    Dec 27, 2012
    Have the tires deflated and turned 180 degrees on the rim. Sometimes this is all it takes to balance the tires without a lot of weight.
    There was a time when a specific spot on the new rubber tires was to be aligned with the valve stem. That is not as important now but some tires do still need to be shifted on the rim to balance better.
  • 2bzy2c's avatar
    2bzy2c
    Explorer II
    Dec 27, 2012
    If you have an F-53 Chassis, there was a problem with the mounting hole for the rim being out of round. Since you have 22" tires, that may not be you.

    If the shimmy you described just showed up with the new tires you just had installed, then the problem is with the balance, since it only occurs at specific speeds. A typical symptom of tires out of balance.

    I have no idea what weight is acceptable. 12 oz seems a bit high to me. indicating something is not kosher with your tire.

    I know this is hind sight, but the Goodyear tires would not be my first choice. I had them on my rig. I had nothing but problems with them. 2 Blowouts, and constant balance problems.
  • dons2346's avatar
    dons2346
    Explorer
    Dec 27, 2012
    You might also consider the fact that one of the new tires goes out of round at speed. I had this happen and the tire was in perfect balance.

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