miamigrrl [midori]

At my 30k service a few weeks ago I had them balance the wheels with some new machine they got in to see if that would fix the vibration problem. Dunno if it was the GSP9700 or similar machine that measures road force. I just noticed yesterday that the weights were placed on the inside of the wheel instead of the edge of the rim. Is there a specific reason for the alternate placement? The vibration is completely gone after this balancing.

Several months ago I had the wheels balanced at a shop that claimed they had the GSP9700. The weights were placed as usual on the edge of the rim. The vibrations were lessened but not totally gone.

So I was just wondering if the placement of the weights was a factor.

ZCD2.7T

I don't think it really matters much where the wheels are placed. I always request "stick-on" weights because I prefer the way they look.

One shop tried to tell me one time that these stick-on weights didn't work as well, because a tire or wheel could have a heavy spot that is near either edge, but I've never had any problems.

By the way, how's the little one?

Egil A64.2s - S6

cosmetic reasons. I guess if the wheels are out of balance by a fair amount a more central placement will be more notisable. Glad this fixed your problem.

PaulW

When the weights are placed on the center of the wheels, normally that indicates a single plane (or static) balance.

When there are weights on the inside and outside edge of the wheel, it indicates a two plane (or dynamic) balance.

The balance machine needs to know where the plane is realitive to the hub (i.e. 8.5" from center, 9" from center) and where the balance weights are going to be added (in the middle or at the edges).

It then spins it up, measures vibration using acceleraometers relative to a known location on the wheel (i.e. 0 degrees).

It then determines residual imbalance and tells the operator where to add weight to the wheel (which is 180 degrees away from the residual imbalance). He then adds weight and the addition of these two vectors cancel each other out (or that's the theory).

Now if he adds weight in the center, than it's a single plane balance, it's a sum of both right and left balance plane.

If it is put on the inner and outer (two balance planes) it takes into account the residual imbalance for both planes.

Generally speaking, a two plane balance can result in much lower residual imbalance of the wheel - i.e. better.

HTH

pw

miamigrrl [midori]

thanks for asking!

He's quite a handfull!! Literally! He's so big he's off the charts for his age! Don't know where he got that from

ZCD2.7T

Good to hear. PICS, we need to see current pics!!! (photo-chop him into a pic with an Audi!)

miamigrrl [midori]

I think I might have a few

<img src="http://www.ferociousfish.com/guppy/gallery/gallery6/images/120_2062.jpg">

<img src="http://www.ferociousfish.com/guppy/gallery/gallery7/images/121_2135.jpg">

note watch for scale:
<img src="http://www.ferociousfish.com/guppy/img/gus_watch.jpg">

miamigrrl [midori]

cool! thanks for 'splaining!

JAA 4.2

You can balance wheels with it several ways. Clamp on, stick on, et cetera. The generic balance doesn't use backspacing. However, if you can't get a good balance, you can key in all the wheel parameters for better results.

ZCD2.7T

"watch for scale"......Bwahahahaha! CUTE kid. Ask any parent - it only gets better. Best wishes.