Why a relative replaced some perfectly good Michelin Tires?

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I've had all sorts of tires and I can say, I've never had extreme sidewall cracks until I had Michelin's. 4X2 LongBed MegaCab, all 4 tires had sidewall cracks , you could literally peel chunks of rubber off with your finger, exposing the steel belts..... I will however have to say, treadwear was great!!!! No joke, I drive hard and the tread wear was almost non existent.