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I would suggest an 18x10" front with a 285/30R18 and an 18x11.5" with a 315/30R18 in the rear. Of course you will need some fender mods, coilovers, and swaybars.

Later, Steve
 

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I didn't realize 315/30/18s would fit. You can do 275/40/17 and 315/35/17 on stock suspension, just need to get the inner rear fenders cut, like Steve said.
 

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The 285/315 combo will understeer, but that is why I mentioned swaybars.

Later, Steve
 

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1st of all Steve's word is as good as gold and the setup he describes would be great. However, if you don't want to do any cutting you can run his current setup (18x9.5 and 18X10.5 with the correct offsets on 275's and 295's).

As far as 17's or 18's, 17's in the same wheel will be slightly lighter as well as brings some of the rotational mass closer to the center of the wheel. Theoretically, this will give a little quicker acceleration. This will also give you a taller sidewall which may increase tire roll. There was an article in Sport Compact Car several months ago that ran a test of this nature and found that the 17 was a tad quicker around a track, but, if I remember correctly, the 17 and 18 were not the same exact wheel.

All this to say it is not enough difference in the two to make much difference so go with the 18's, cuz they look better!

Kirk
 

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Don't forget that as you go from 18" to 17" the sidewall of the tire also increases. There is not as much of a decrease in rotational mass as you think, because a tire weighs about the same as a wheel in Supra sizes.

Later, Steve
 

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You will need to trim/roll the fender lip. I assume your talking about 19" tires, because I don't believe anyone make a 305 in an 18" size.

Later, Steve
 
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