Switched to 18" Konig 18x8 Rennform wheels and 225/45/18 Bridgestone Driveguards. Great improvement in ride quality.
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2014 X1XDrive35i, Ultimate Package, M Sport Package, Mineral White Metallic, Black interior, Konig Rennform wheels, Bridgestone DriveGuard tires
also: 2006 M Roadster