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AWD - Measurement to determine bent alloy wheel

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Measurement to determine bent alloy wheel V70-XC70 2004

I'm having some tire vibration and uneven tire wear on my 2004 V70R. Local tire shop says bent wheel. Volvo dealer says wheels are ok but belt separation in the Pirellis. Pirelli dealer says tires and wheels ok but alignment problems. Aaaarrrggghhhh.

All the balancing/force balancing and rotation haven't worked, so I'm starting from zero again. First, how does one measure for a bent wheel? That is, if it isn't visible when you revolve the wheel with the car raised on the jack, where do you measure to see what the run out is? I used my trusty Chinese dial indicator against the outer edge of the rim and got a pretty wide spread of measurements, mostly I think because the outer face of the rim is machined rather unevenly. Is there a place on the rim that you can reliably set the stem of the dial indicator to check the run out, and what is allowable, ie: within Volvo spec?

Thanks.





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Find a shop with a 'Hunter GSP9700 'Road Force' balance machine' .... V70-XC70 2004

This thing is a miracle worker!

It will not only measure your wheels and tires separately, but also show how to rotate the tire on the wheel to best combine their imperfections; and it will then indicate which tire to put at each corner of the car to balance out any residual forces!

You can find a local shop with one at:
http://www.gsp9700.com/

Good luck.





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Find a shop with a 'Hunter GSP9700 'Road Force' balance machine' .... V70-XC70 2004

Thanks for the useful input. When the problem got really annoying, I did go to a shop with a road force balancer, Discount Tires in Columbus, Ohio. Should have mentioned that. The road force balancing had no effect on the problem, vibration and tire noise still there. Because of that, Discount told me the problem was alignment and sent me on my way. They worked really hard to analyze the problem, but I think it was already too late, that is, two tires had already been cupped somewhat and one had a fairly large angled flat area across the tread. I found this, they didn't.

So, I checked the wheels myself for a bent one, that is, for wobble in the rotation, and did find that one of the OTHER wheels, with a uniformly worn tire, had what I would say was a pothole sort of bend, that is the inner flange of the rim had a distortion of several thousandths of an inch. No other wobble of more than a few thousandths on any of them, though. This was measured by setting a dial indicator against the inner flange of the rim and doing a very slow and careful rotation of the wheel. The inner flange is very even and smooth, as opposed to the outer (visible) side, which has noticeable irregularities on it. So, I've ordered a pair of new Bridgestone Potenza RE960AS tires from Tire Rack. When they get here I'll have an all-wheel alignment done and mount and balance the new tires.

I think I've experienced simple tire failure, from the set of Pirellis that were new 22,000 miles ago. The two that went bad did so on rims that run true, so far as I can tell. The "bent" rim, which gave me no tire trouble, is bent very little, and it has no side-to-side rotational irregularity, so I don't plan to replace it unless someone can give me a good reason. And, I'm going to commit the unpardonable sin of mixing tire types on the car, new Bridgestones on the front and the remaining pair of Pirelli P6 All Seasons on the back, until they are worn enough to replace. The two brands are rated so close together that I don't think the car will know the difference. I'll have the tire shop give me the numbers on my present alignment before they change anything, and if it is very far out I'll post it here. Absent any other evidence, I'm thinking I just got a pair of bad tires. And I'm switching brands because who would want to repeat the same problem?





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Find a shop with a 'Hunter GSP9700 'Road Force' balance machine' .... V70-XC70 2004

Good stuff but when you rotate your tires the problem will be return. Better to find and fix the root cause.





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Measurement to determine bent alloy wheel V70-XC70 2004

Bent wheels are pretty common. They can show this to you on a wheel balancer. If it's really out it will be pretty obvious.
I had a dealer pull the same crap with me. In the end a good used wheel (erievovo) got the problem sorted out.
Next time I'm in Mass. I'll get the bent one fixed. http://www.rimandwheelworks.com/index.html

They repaired one of my Audi wheels. Amazing results!





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Measurement to determine bent alloy wheel V70-XC70 2004

They are giving you the run around, but I recommend that you start with an alignment. Good luck!


Learn Spanish





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Measurement to determine bent alloy wheel V70-XC70 2004

My 89 R has 16in wheels that measure 17 5/8in in diameter at the lip of the bead. I know that doesn't help any...

There should NOT be any rough casting areas on your wheels, at all.

Alignment problems do not cause rotation vibration.

My dealer also said my tire belts were no good and it turned out that the rims(2) were bent. When the tire shop spun the wheels slowly, you could then see the distortion in the wheels.

Sounds like the dealer doesn't want to replace the rims :)

Klaus





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