Condition of damage
One side of the blocks and / or lugs on the tread wearing faster than the other side circumferentially like sawteeth
Causes
1. Tires are not rotated timely
2. Underinflation and / or overload
3. Sudden braking or rapid acceleration
Recommendations
1. Rotate tires timely before heel & toe wear becomes serious
2. Use tire under proper air pressure and load
3. Avoid rough driving