Low PSI can cause the sides to wear. Never heard of just one side wearing.
Look at the AVON's = they make a tire just for GW's = great service, great ride, great mileage. Google AVON USA & call their 800# for the AVON P/N.
Got F&R from Dennis Kirk @ my door for $299.xx. I really like dyna beads, 1oz F; 2oz R.