Wheel hub system including a retainer for positioning components during assembly

A wheel hub system, comprising:

• a hub assembly including:
• a hub having a though-hole, a circumferential groove formed in the through-hole, and a first support surface having a first plurality of teeth, and
• a bearing unit positioned on the hub;
• a joint component secured to the hub assembly and including:
• a projection positioned in the through-hole and having a threaded bore and a retainer positioned in the circumferential groove, and
• a second support surface having a second plurality of teeth operatively engaging the first plurality of teeth;
• and
• a threaded bolt positioned in the threaded bore and securing the hub assembly to the joint component, wherein the retainer is, by being positioned in the circumferential groove, configured to hold the joint component to the hub assembly in a position in which the second plurality of teeth engage the first plurality of teeth prior to the threaded bolt being positioned in the threaded bore.