BMW 128i tire size
The most common factory tire size for the BMW 128i is 205/50R17 front, 225/45R17 rear, on 16 of the 16 year and trim fits listed. Each year below lists the sizes its trims were built with (2010 to 2013). Pick your year and trim to see the tires that fit.
Check your own tire
A trim can be sold with more than one wheel size. The size printed on the sidewall of your current tire, or on the placard in the driver's door jamb, is the one your vehicle has.