Tire/wheel size logic for FWD?

yes and no.

no:

small wheels in back and big in front would screw with the balance. traction in front increases, traction in rear doesnt or possibly even decreases if you decrease tire size. you would no longer need to worry about understeer, but oversteer would be increased. your front would grip more then your rear. you could very easily end up spinning out of control.

in a rear wheel drive vehicle, not only is accelaration in the rear, but they tend to have a tendency for oversteer anyways. especially if you over throttle while steering. so they dont have the same balance issues.

yes:

drag racing. this is where you normally see big tires on the drive wheels and small ones elsewhere. this is to reduce weight and friction caused by a bigger tire then is needed when not cornering.

front wheel drive may have larger fronts then rears on the drag strip, but handling is not an issue on the drag strip. traction on the powered tires is.

for street vehicles, unless you have rear wheel drive, and either have done major modifactions to increase power or it came that way, increasing rear tire size and not the front is purely for looks and may reduce overall handling by interfering with the balance the vehicle was originally designed for.

take my chevy silverado. cornering at high speeds with no throttle applied it understeers some, it wants to keep going straight. apply lots of throttle and it wants to oversteer, the rear wants to slide. enough pressure to keep speed the same or for very gentle accelaration and it hangs perfectly balanced.

ifi changed the tire width of just the rear i would lose that balance. it would understeer more and possibly not oversteer at all, even when i wanted it to in order to save my life.

and yes, throwing a vehicle into a spin on purpose can be a life saving manuvuer. it can even be the manuver that keeps it from getting wrecked it. i did a full 720 on the freeway once and came out of it still going 45 in the right direction. had i not thrown it into a spin i would of gone off the side from the radical movement to dodge the sideways sliding car coming across me path in front of me.

No your not stupid the front tires should be the two in the best of shape but use the size recommended on the drivers door decal for a safer FWD car.

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