my rear back tire is wearing chopie i like to know what could cause it,some body help me.

 

alignment and or lack of rotating them

 

If the tire is wearing in a scalloped pattern ( high spots on one part of the tread ) it is usually do to a bad shock. You have a relatively new car, so im going to go with a tire that isnt balanced correctly. If the thread is really that bad you may need to replace it and start over. If its not that bad then take it to a shop and have them rebalance that wheel. If the wheel comes back perfectly balanced then i would look into the rear suspension.