To try to answer Tim W's question:
Does this also eliminate ceramic wheel bearings?
D.9 suspension
Suspension is defined as the system of springs, shock absorbers, control arms, links, mounts, etc., supporting the vehicle on its axles. Sway bars, sway bar links, steering components, wheels, etc., are not considered as suspension in this section.
All suspension components shall be of steel or ferrous material, with the exception of hubs, hub adapters, hub carriers, bellcranks, pivot blocks, bearings, bushings, spring caps, abutment nuts, mounts, shock absorber caps and nuts. Titanium and carbon fiber and other non-metallic composites are prohibited in any suspension component.
It doesn't say anything about wheel bearings... but it does say bearings. And it could be argued they support the vehicle on its axles. Is ceramic a non-metallic composite, or a ceramic? Clear as mud.
What really troubles me most about this paragragh is the two uses of the word "
etc." Those are not
clarifying words. More like open barn doors.

Maybe wheel bearing fall under one of those "etc". Don't worry though, so many guys have them, surely they will
grandfather them in.

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