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I agree with IllFG2. If you have larger front tires on a front wheel drive car, it will pull the car through the corners better. Think about it, the more grip to the front the better. In a FF the front tires not only need to steer the car, but also pull the car, therefore they need more traction, especially in turns otherwise they will understeer. This is also why in FF cars the spring rates in the rear are stiffer than in the front, and why they use front spoilers not rear ones. You want the rear to have less traction than the front to artifically induce oversteer, before entering a turn. Then while going through the turn after the oversteer has been induced by the rear having less traction and stiffer suspention, the front wheels with more grip will pull the car though the turn.
As for the RWD, when most RWD cars spin out, I am guessing 90% of the time they applied to much throttle, the rear tires lost grip, and the car spun. This is why rear wheel drive cars spring rates are lower in the rear, and they have spoilers to add downforce to keep the rear planted.
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