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Originally Posted by TaMbALoLoNg
I agree pretty much 100%, but the difference between 275/40 and 295/40 is only 8mm, which is practically nothing and you can pretty much balance it out if you have less PSI on your rear tires. It shouldn't put significant amt of stress on the drivetrain worth worrying about.
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I don't know how you're doing your math but the difference in circumference is around 100 mm and the difference in diameter is 32 mm. That's a 4% difference in rolling diameter which is outside the recommended maximum difference of 3%.
There are other considerations besides drivetrain stress. DSC and ABS both rely on sensing rotational differences between tires. It's possible that introducing differences under normal driving conditions could throw those systems off.