The main reason for this to happen is low air pressure. When a tire is run low on pressure the center gets soft and all the weight the tire carries is put on the edges, that,s why the edges get worn much faster. Just the opposite happens with too much air pressure the center gets hard and wears out before the rest of the tire. Tire pressure is important for good tire ware, gas mileage, and making those tires last just as long as possible.
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