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I would check the circumference of the tyres (tires) at the middle of the tread accurately with a tape and report back the difference if any as someone may have a tolerence figure published in a specification.
It is recommended that the the rolling distance should be the same front and rear but surely a slight tolerence is acceptable. A variation front and rear makes the centre diff. set up work overtime.
You will appreciate that the wear factor must be taken into account as well as the brand and tread pattern. A new matched set from go, rotated regularly is the best way to go but we all have financial limits to be sure.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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