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I highly suggest increasing the sidewall by 5% front and rear. 245/40/20 fronts and 275/35/20 rears, it will give you extra rubber like having 19" wheels. Make sure you use the recommended air pressure as if you had 19" wheels on your idrive or you will have uneven tire wear. It will wear out the center of the tires & you will still get a bulge with higher air pressure if you hit a pothole hard enough.
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2018 M550I Xdrive Alpine White on Cognac Leather, Premium Enhanced Package, Drivers Assitance Plus, Remote Parking/display key, massage seats, 21 wheels style 629 Black Chrome. M performance brakes in blue, M performance carbon fibre diffuser, m performance side skirt extensions, m performance front lip. 45% tint, roof wrapped in gloss black.
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