205/45/17 or 205/40/17 Front & 215/40/17 Rear

[kimona]

Originally Posted by Biggie™

If you run the wider tire in the front and the narrower one in the rear it will improve cornering. Running more rubber in the rear on a FWD car will promote understeer, something most people try to overcome by using big rear anti-roll bars.

Personally, I'd run the same size wheel and tire front and rear on a Yaris. That way you can easily rotate the tires to increase longevity.

If you're going for best fit and looks (and drive within the limits), then running 10mm's more rubber in the rear won't make any noticeable handling difference whatsoever in everyday driving conditions.

If you plan to race with your everyday tires then take into consideration an application that works best.

If you're a fan of tire rotation (which I am not) then staggering tire sizes will prohibit rotation and decrease tire longevity some.

I've seen dozen of Vitz in Japan with staggered offsets (very common application), and many with staggered tire sizes. In Japan its all about the perfect fit. For those who race their cars, they almost never use their steet wheels/tires.