I picked up a 2014 535i about 2.5 months ago with the luxury line 19". Ditched standard suspension to go with ACS Springs, Koni FSD, 650 rear sway bar - need all of them for this car. But the finishing touch was ditching the run flats - and going with Michelin Pilot A/S 3+. Makes the ride more supple/less harsh with improved handling. Gets rid of the problems with the standard suspension.
I like all tires with the same size - rotation, longer lasting. The rear wheels wear faster. The only way to rotate a staggered setup is a purchase.
Good luck.
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2017 540i M, Carbon Black/Mocha, 20 in. on Michelin PS4S, CF Mirrors/Rear Spoiler
2009 328i 6 spd stick, Crimson Red/Sport Suspension, Bavsound Stage 1, 2
Former BMWs: '79 320i, '84 325e, 2000 328i, 2014 535i
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