WARNING: This page is about a different car, the 2018 BMW X4, 2017 BMW X4, 2016 BMW X4, and 2015 BMW X4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Adapter N4 (Ø 39mm) in connection with adapter kit 2 (BMW), (81 64 2 155 746), for removal and installation of wheel bearings, propeller shafts and drive flanges.