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the problem with using 255, 265, 275 tires on the back is that this car comes with a stock 245/35-18. the available 255, 265, and 275 tires use the same aspect ratio (35%), which means they're increasingly larger in diameter than stock. this car is already geared longer than i'd like, and each of those will cause a linear increase in the gearing ratio, whch equates to a linear decrease in torque application.
simply put, those tires are just too tall for this car. 285/30-18 is an available size, and is closer to the correct diameter (because of the 30% aspect ratio). i'll be using toyo T1-R 255/35-18 in front and 285/30-18 in back as soon as some wheels with workable offsets become available.
if you're putting a limited slip diff in the car, get one with a significantly shortened final drive, then 265/35-18 and 275/35-18 will work better.
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