What's going on with my tire wear- rears are wearing out in the middle?

[Jordo]

I think your contact patch is spot on. Now you got me scratching my head. Ok, who is the manufacture, how many miles you got on'em?

[JavX5]

It's the OEM Diamaris tire, I have 52K on the car, but I replaced the rear Diamaris' a year ago with 50% tread on them, and they looked fine

[JimG]

Your tires are too far gone to do anything to extend there life, but for the next ones you should verify that whoever is checking your tire pressure is doing it to spec. Tire Pressure | Firestone Complete Auto Care indicates that you should be running 32lbs F & R. But you should also look at the label in your car.

[mywidebody02]

I had the same problem and always ran the factory PSI. I had worn rear control arms and had them replaced. So far my new tires have 10k and wear even. The wider tire and high speed staight high way driving on that wide ov tire could also help cause the center wear.

[Cisc0]

My vehicle came stock with 17's and I am now running 20's staggered so I cannot go by what the placard on the door says about my PSI. For those who's vehicles came factory with 20" staggered (4.6is & 4.8is) what does the placard on your doors say?

[cfmistry]

Originally Posted by Cisc0

My vehicle came stock with 17's and I am now running 20's staggered so I cannot go by what the placard on the door says about my PSI. For those who's vehicles came factory with 20" staggered (4.6is & 4.8is) what does the placard on your doors say?

You might want to check the placard again. It has the pressures for all sizes on there (17",18",19",& 20"). The 4.6is/4.8is 20" tire is suggested 32psi front and rear, given a normal load. Your X5 with those wheels and tires should be kept at the same pressure. If you are pulling a trailer or have a heavy load, I believe the rears go up to 37psi.

-Cyrus

[andrewmr]

How fast are you driving?

Contrary to everyone that says you're overinflating the tire, you could be running the tire too low. Big heavy wide low profile tires need air pressure to support the weight of the carcas.

Not knowing any of the particulars you may want to contact the tire manufacturer to insure that you are running the proper wheel width and air pressure.

[Mike V]

What is the wheel width and tire size? Maybe you're running too wide of a tire and it's causing the middle to bow out a little.

[joeboch348]

i was always told the rear wheels should be a little kicked out on the bottom. my tires look like the inside should wear but they wear very evenly.maybe yours are dead level? i wouldnt go below 35psi

[cfmistry]

Originally Posted by joeboch348

i wouldnt go below 35psi

I'm not sure what size tire you are running, but for the 20" OEM wheel/tire setup BMW recommends 32psi.