265/60/20 to 275/60/20 why gm did this ?

[Big Kahuna]

so the at4 come from the factory with 3 different size tires 275/65/18 265/60/20 and 275/60/20 , what I don't understand is why gm put different size tires for the all terrane tire what is 275/60 /20 and mud terrane they put 265/60/20 WHY ??

 

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