Behind new five - stud 15in BBS alloys were the
stronger stub axles and wheel bearings from the 528i, plus upgraded brakes (280 mm
vented discs at the front, 282 mm solid ones at the rear) with a Bosch ABS system.
These are widely available in bolt - on form, which allow for upgrading older cars to
disc brakes, or adding specially designed brake pads,
stronger calipers and longer, better
vented discs.