Wheel Bearing Issue or Tire Issue

[ibra0078]

Good Day,

I been hearing this loud growling noise coming from the rear, I would like to say that it started to happen when I put my summer tires on few months ago. At higher speeds it would sound like an airplan is flying over me the faster I go the louder the sound is. I first thought it was my wheel bearing but now I think its a wheel issue because I did perform the 3 and 9 O`clock test on the all wheels and there is no play, Also when I was hearing the noise I would slightly turn right and left to see if the sound gets louder or quieting but the sound remained the same. I know if I go really slow its like I can feel the tires rolling. Yesterday I took a good look at my back tires and this is what I found after doing my research it seems my back tires are scalloping. Attached are some pictures that I took and I think this is the issue, Both back tires have uneven thread on the inner edge of the tires. I remembered 2 years ago I replaced the front ones with Michelin Harmony which they are discontinued now but at the time the back ones did not need replacing. I believe the back ones are original when I got the car in 2008 they are Tiger Paw AWP II. How does Scalloping occur? bad suspension? Car just got an wheel alignment last month so it drives straight now after getting the front tie rods replaced. Should I just buy 4 new tires and try sell the 2 front ones as they are in great shape, if so what do you guys recommend, Are Michelin Defender any good? What do other people here have on their Grand Prix, I would want something that provides the least amount of road noise. I hope new tires will resolve my issue but however im heading on a road trip about 900miles this Friday is having scalloping tires in the back bad to drive on? I would rather buy them in the US as they are cheaper and I will be there anyways.

Thanks

Car is a 2008 Grand Prix Base

 

[Scottydoggs]

when you got the alignment done, did they do the back 1/2 of the car?

could be the back end needs to be aligned, or under inflation or over inflation of the tires can cause the uneven tire wear.

those would be the only reason really for that kind of problem.

ive learned my lesson with cheap alignments shops, i only go to places that have computer 4 wheel alignments.

 

[ibra0078]

Yes they did the back 1/2 as well, I was wondering would that explain the road noise I am hearing?

 

[Scottydoggs]

messed up tires could, you could rotate the tires to the front, see if the sound follows.

 

[ibra0078]

Turns out to be the tires I bought it to a mechanic, now question for all of you guys, I have Micheline harmony infront as they are 1.5 years old with lots of thread on them. They so not sell the Harmony tires anymore as the Michelin defender tool over. Should I replace all 4 tires with Michelin defenders or two to find 2 harmony tires as I checked the Canadian tire site and they said they had some. I find the harmony tires as loud road noise to and wheel shakes sometimes at higher speeds. What do other people here have on their Grand Prix? Thanks

 

[Trann14]

I just got a set of the Michelin Defender tires about two weeks ago and they are great. Ride is really smooth and quite and they seem to have pretty good traction and do very well in the rain. I strongly recommend these if you decide to get four new tires.

 

[WPOD]

Michelin Pilots! lots of "open work" to channel away standing water--even at 80+. ran the first set REAL hard, still got 27mpg on cruise at 75, flat spotted one when a wheel sensor went bad and I had a few seconds of lockup at around 90mph, and now with 20k *Hard* miles I'm about half tread depth and ready to buy another set.

 

[smoke14]

Iv had my Michelin Harmony tires for about 3 years now and they still got lots of tread and my wife's gp has Michelin x-ice in the winter. I've also had Michelin Pilots on my 18"s. they didn't last as long but still happy with them.