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Found the info for previous question new question.

I have 19x8 square but now im going to get 19x9 fronts and 19x10 rear but what tires size should i get? i am going to lower my xi in the near future, im thinking 235/40/19 front and 275/45/19 rear. i see that its all about rolling diameter with the tires but how do i measure it exactly?

any opinions will be helpful