Not sure what rimDiameter size options are for your 2021 BMW 840i xDrive Convertible with 18-inch wheel?
Choose from the options below.
Version/Option
Tire Size
245/45R18
Front: 245/45R18, Rear: 275/40R18
275/40R18
Version/Option
Tire Size
245/45R18
Front: 245/45R18, Rear: 275/40R18
Version/Option
Tire Size
275/40R18
Version/Option
Tire Size
245/45R18
Version/Option
Tire Size
Front: 245/45R18, Rear: 275/40R18
Version/Option
Tire Size
275/40R18
Find your version / option
There are two places to find your tire size. Look directly on your tire sidewall or inside your driver’s side door jamb for your vehicle’s tire size.
Passenger Tire Sidewall
High Flotation Tire Sidewall
Inside Your Door Jamb