My rear left tire is wearing chopy in the inside,need to know what can be the cause please .

 

could be an alignment issue, if it under warranty have them check it out, but most likely its just because you never rotated your tires, keep up on it and do it every other oil change, and check your tire pressures too

 

The rear allignment is generally no adjustable. I would have it checked for damage and balance.

 

Yea, the only real adjustment you can make to the rear is camber.

 

just replaced tires on my box, the 18" tires did wear choppy on the inside of the left rear, my problem was that I did not rotate the tires when they needed to be, if they start to make noise, good indication that perhaps they need to be rotated! Hope this helps!