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While I don't have the education to argue with wxman's physics, I'll blame it on tire compound and tread pattern/depth.
I cant see any way that a bigger tire would not be harder to turn. More rubber = more traction...other wise we'd be putting skinney tires on the back for more traction when we get to the drag strip.
Were your old tires bald? Did they have a lower PSI rating? Did they have steel belts hanging out?
I just don't see it being easier...esp since I have taken 31 10.50's off of the front of a 69 GMC long bed and installed 205/75's on it and it was like adding power steering.
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