Noobish comment but why?
Search?! You are a mod afterall!
Every major manufacturer states that new tyres go on the rear of a car, be in FWD, RWD or 4WD. Places such as Costco refuse to fit new tyres to the front wheels on a car if you just replace a pair.
All to do with controlling understeer / oversteer.
New on front!
I'd put them in place of whichever aren't legal anymore :rasp:
I'd say new on the back, because the fronts wear out and the rears rot, so when the fronts wear out move the backs to the front and fit new rears.
i think the info we need to know is the condition on the other two tyres staying on the car
if they are only worn 1-2mm from new i would put new ones on the front.
if the other two tyres are within the last 40% of there life i would put them on the front to "wear them off".
that way once they are worn off, and your replace tyres again you will have equalish tyres all round
hutchie
fronts probably have about 60% left. The rears are pretty much rotten, covered in cracks on the sidewalls and ready to pop.
in this case i would put new tyres on the front.
you are not going to feel the benifit from having more tread than 5mm on the back.
and that way you should have evenly worn tyres in circa 30k.
30k I struggle to get 6k out of my tyres