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the tires on the windstar have about 110K on them. the side wall pressure is 35 but i have run them at 40(air) most of their life. i was rotating them Saturday so i measured the tread depth. all four tires had different average tread depth. they ranged from 3/32 to 5/32. But they all were consistently 1/32 less in the center groove than at the the two outside grooves.
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