Curved magnets. Pretty big air gap though.
I imagine all the outrunners have the same difficulty replacing bearings. If it’s harder to get them in and out the better and tight tolerances. I glue them in.
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Looks good, i want to build an ebike with a small motor
On the radium motors the bearing change looks a lot easier compared to my flipsky https://www.youtube.com/watch?v=gf1FX3kknus