This, after reading this post: viewtopic.php?t=1365
I find there are ceramic bearings, both full ceramic (the balls, and the races, are entirely ceramic), and hybrid ceramic bearings (in that the balls are ceramic, while the races remain steel). as far as heat, the ceramics do not tend to produce heat, and do not expand, as steel does, under heat. there are differences, as shown by the manufacturer, such as the possibility of shock loading being a factor. riding on footpaths, rather than the paved road, often leads to shock as in going over bumps and uneven pavement. Steel is good at that, but i figure that when the whole thing is hot, the steel races and the bearings being a steel/steel/steel sandwich of sorts, expands into each other and can cause deformation of the balls, due to heat increasing malleability of the metal.
the current motor and brushes have tons of life in them, it's the excessive heat caused by the bearings dragging the motor and drawing more current up to the amperage limit of the controller, causing frequent shut down, even on mild grades.
I am faced with a choice: buy a brand new motor, or purchase replacement bearings for my current motor, with the ceramic replacements being the solution to the heating and longevity issue. I also find that ceramic bearings, frequently require quite little lubrication (although, lubication is ALWAYS a positive thing) while steels, even sealed ones, would still demand periodic and more frequent lubrication for maintenance.
ideally, but not agreeable with my billfold, i would choose to buy a brand new motor, and replace the stock steel bearings with ceramic bearings. this should increase my range and the life of the motor dramatically, i imagine.
there, now i have a sub-choice. full ceramic bearings are in the $100 to $150 usd range, while hybrid ceramic bearings are half that. i have not been able to get an answer, whether the full ceramics are hardy enough for daily use, and offset the negative benefits of the steel races expanding under heat. this is the website I found the ceramic bearings (https://www.bocabearings.com/products/6 ... i3n4-14589) , and I also find the bearings used in my motor are stock sizes for skateboarding applications, as well.
the main bearing is 6000z and the commutator support bearing is 608z, also used in skateboards and such.
so much information, and i'm hamstrung by my billfold limits, heh.
maybe some chap can test this theory for me.