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Old 03-09-09, 11:22 AM   #1
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broken belt in tire, now vibration

Had a broken radial belt in my rear passenger tire. Took rim/tire to tire shop and had new tire put on rim (stock phone dial rim). They balanced the tire, so it should be good.

Now I'm getting a pretty good shake/vibration at higher MPH (40-50+). I am thinking u-joint/driveshaft, so today I put it up on rear jacks to do a prelim visual inspection. There doesn't seem to be any play in the u-joints (haven't removed exhaust yet, so not sure).

So I released the parking brake, started the car, and put it into 1st and let it idle/spin. Looking at the rear u-joint, I can't really tell if it's wobbling or not (will know more when I get a clear look). So, I moved it up to 2nd and let it spin.

However, I did notice that the rim (one that had the bad tire) seems to spin either out of round, or off center. Not a side to side wobble, but a clear up and down out of center. Not very much (< 1/8 inch?), but I'm certain that would cause a pretty good vibration at higher speeds.

My next move is to swap rear rims and see if the problem lies with the rim, or with the hub or drive axle. Any way they could have successfully balanced the tire with a bad rim? Thinking not.

So, lets say it's not the rim... ( I know, I'm getting ahead of myself), what would be a likely culprit? I think if bearing was bad, I'd have other symptoms (squeal/thump). Still not giving up on the u-joint/driveshaft issue either. However, the noticable rim thing is highly suspect.

Could the bad tire have caused the vibration, or did the vibration cause the bad tire?

mucho thanks
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Old 03-09-09, 12:00 PM   #2
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Update

So my curiosity was getting the better of me, so I ran out and swapped tires. In taking off the drivers side, I noticed it was shot too (belt showing). Geez why the hell didn't I even look at it when I found the other one????

So, off to the tire shop again. But... I suppose the broken belt on one side could have been jumping up and down enough to cause the other side to go bad if I drove on it enough (have no idea, the suspension is a bit rough to begin with).

Guess I'll see if it smooths out with some more new rubber
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Old 03-09-09, 06:37 PM   #3
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Still vibrating I had my son drive it while I followed him down a fairly smooth road. The rear end seemed to be tracking OK and the tires weren't hopping, so I'm thinking u-joint. Guess it goes back up on the jacks tomorrow.
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Old 03-09-09, 06:37 PM
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