I really let them wear out,and I think I hit something in a parking lot before I got on the freeway. ANYWAYS, the tire rolled great at he high speed and I only felt a sway in the rear, and did nt know for sure something was wrong till I started to smell rubber burning and I noticed a lady backing off behind me...I nursed it along the side of the high way and to a Mac Ds where I changed it out in five min.The tire was toast..the inside wall was rags all the way around so the Yokos do well on blow outs ..but they only last about 20k..aand they don't smoke on burnouts,,,,I got some 275 ecstas to relace them.....my donut worked amazing ly well.