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Possible delamination of the tread surface from the carcass, sometimes occurs if the tires have been subjected to heavy shock-loading, ie, from a very broken road surface or potholes. Jack each wheel up and give it a spin while looking at the tread surface, you'll see lumps in the tires if this is the case. Unlikely on a Japanese tire but I know its something that occurs with pirelli's (P6000's mostly) after they get heavy impact.