Equipped with the optional $2,300 sport package, our tester welcomed us with its lowered suspension, hip-hugging front seats, active roll stabilization and Bridgestone Potenza RE050A run-flat tires: P245/40R18 up front, P275/35R18 in the rear. Unlike many automakers offering run-flats, the 550i also offers a space-saver spare tire — hidden inside its enormous trunk. With such low-profile tires, the spare is a nice option to avoid the risk of damaging costly rims.
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