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To be honest there is more variables than just weight and diameter since a saw the difference when switching back to my winter tires so different, width, tread design, conpound, diameter and weight and I agree that weight is not a major one here (but I know that going down to 17 inches will cut it and will be good for performance).
I will still do some additionnal research on internet but will likely try 245/40/17 RE71-R on 17x7.5 wheels this year. To me it looks like the most optimal setup for F-Street unless I find evidences that 225 would be better on 7.5 wide wheels.
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