Hi, i also own a pre-Lci 335xi and what the delearship told me is that the all wheel drive system has to have the same height of tires. The height is determined by a percentage of the the width and the two sizes that work are F-235/35/19 R-275/30/19 and also the stock combonation F-225/40/19 R-255/35/19. These should both work since there heights are very similar. Hope this helps good luck
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