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All of you seem to be implying that a 275/35/20 is taller than 305/35/20. Are you sure you mean that? Because that's not true at all. A 275/35/20 is 27.6" tall, and a 305/35/20 is 28.4" tall. That means the rears are 2.9% taller than the fronts, and the rake is not reversed. That still may be too big a difference in diameter, though. The SS 1LE fitment is 26.7 and 27.2, for a 1.9% difference in height. I am getting away with a 2.7% difference in tire heights for autocross use (although the tires are shorter overall at 275/30/19 and 305/30/19).
As a general commentary, I will never understand why people insist on putting taller tires on performance cars. It's generally not good for handling or acceleration, and it can cause tire rub. Note that for the top-performing Camaro, the ZL1 1E, Chevy uses 19" wheels with significantly shorter tires than the SS 1LE.
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Matt Miller
2020 SS 1LE
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