My rear had a strange side to side motion when at 10mph or less, Well this weekend it got a bit worse and then more worse. then plane bad. Got to checking and found the problem.

 

Looks a tad underinflated!

My car did that once,kinda wandered around in back.I thought it was a tire,but turned out I twisted a trailing arm bracket clean off the axle!!No more donuts after that little experience....

 

This tire/wheel had 2 large weights and one small on the back and the large on the front so I bet the tire was bad when it was put on by the PO.

 

Mmmmm Tread De-Lamination. I suggest you sue the tire company and Mazda for all they are worth. Force them to recall all tires of that model.

 

That's a keeper. Hang it on your wall.

 

Sometimes my girlfriends rear has this problem.....rofl