My front tyres are worn out on the inside of the tread, but rears look good for another 5k miles. Is it recommended to replace all tyes at once or can I just replace the fronts? Would it make sense to move the rears to the front, and put new tyres on the rear. I'm using SO2's.

 

IMHO It would probably be bests to replace all 4 if you can afford it

Niall

 

Replace all 4 at once otherwise you will mess up the handling and put extra strain on the centre diff.

 

Replace them all and keep your old tyres for track days .