before you go spending money buying a new tire that may not need replaced take it to a tire shop and have them dismount the tire and inspect it first. even if you see a small groove on the outside it could be completely safe. the rule of thumb is if you cant see the cord/belts you`re alright. ive worked in a tire shop longer than i care to admit and have seen this plenty. and as far as rotating goes you do want the best in the rear. lets say youre taking on on ramp on a day when there is rain or snow, do you think it would be easier to correct if the rear tires give out or the front. it applies to all vehicles. that doesnt mean dont rotate your tires though, you want them to wear evenly. also if it has been 20k and no rotates make sure you cross the rears when you rotate them to the front as they are probably feathered and crossing them helps to fix/prevent that. they say its always best to cross the non drive axle when rotating so for a fwd the right rear goes to left front left rear to right front and the drive axle wheels straight back. obviosly the opposite for rwd. awd cars you do the same as rwd rotates, cross fronts to the rears and rears straight up.
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