Correct me if im wrong but doenst a front tire have a full line going straight down the center of it.

Thats a picture of a back tire.

The wear is because of highway riding and wheelies and burnouts. Whatever doesnt put the tire on the side(which is mainly highway riding) will make your back tire form a flat spot in it straight down the center. Mine has it from so many wheelies but I am trying to slow that down and I have been taking corners like im crazy