I am running stock suspension with 255/35 Front and 285/30 Rear with zero problems. Rides great handles great.
http://www.bimmerfest.com/forums/sho....php?t=1021529
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2014 BMW 535i X Drive M Sport
Carbon fiber Performance rear deck lid, Carbon Fiber Mirrors, Carbon fiber front bumper spoiler, M Performance exhaust and 20" M5 343M wheels with MPSS tires