Boron Aluminium Magnesium is the slipperiest material known to man, it is also nearly as hard as diamond. Wheel bearings using a BAM coating could measurably reduce rolling resistance and increase the life of bearings.
I wonder if any thrust bearings with BAM coatings are already used in consumer applications. I also wonder if BAM coating companies have bearing demonstrations.
https://interestingengineering.com/bam-slipperiest-material-world
Another interesting coating is Diamond Like Coating. From what I can tell DLC is more common and is even used in high performance car engines today but isn't as slippery as BAM. DLC also has excellent wear characteristics.
Neat!
You probably know about this Zero wear/ maintenance technology too:
https://www.advancedmotionconcepts.com/air-bearings/#:~:text=No%20wear%2C%20minimal%20particle%20generation%20and%20no%20maintenance,of%20pressurized%20air%20to%20support%20the%20carriage%20load.