One should be just fine if there is hardly any wear. Rotate the two rears to the front and then let the new tire wear in on the rear.
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Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming ...."WOW! What a ride!!!!!"
LUNCH with THEOLDMAN...On a break for now...