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Eric, welcome to the forum!
For a 19" rim and a stock motor, it is best to run 255 in the front and 275 in the rear.
If you are supercharged, go as wide as you can! I would say 275 in the front and 315 rear.
It all depends if you want to have more grip or more balance
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2021 M3 6MT Brooklyn Grey/Silverstone
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