Donepart 684ZZ Small Bearings 4mm x 9mm x 4mm Double Shielded and Pre-Lubricated Deep Groove Ball Bearing (20 Pcs)

nice replacement bearing for my iflight Xing motors 2206- 2208 an 2306 motors I have. sure many more can use these . they seem to be very close if not the same bearings Xing is using.still looking maybe for ceramic bearings for my motors .it made a big difference in my rc trucks an I just have ceramic on my mind I curious lol,but these are enough so I stop even looking lol.just need to see if these bearings hold up.

Have not used them long term or anything. Just an initial review. My use case is light though, not many rpms/load.

They are roller bearing just what you need

The bore is 4mm rather than 5 and they will not fit the titan aero extruder or the genius or sidewinder x1 extruder. For the genius extruder you will need the 5x9x3 ball bearings 5mm bore 9 mm OD and 3 mm thickness. These are 4x9x4 so they are thicker by a mm and the bore is smaller by a mm. It was my error not knowing that they are not exactly the size I needed. Not sure on the qualityThe Bearing on the right or with the smaller inner diameter is the one listed. The other bearing is the bearing needed for titan aero or artillery genius / swx1Moreover the regular titan extruder take a larger bearing, FYI.

a few stick did not turn very good

Not really impressed by these bearings, the tolerances seem to be loose..i find the inner race wobbly and these bearings are “rough”. I Replaced my original motor bearings that were damaged/rough with these and they sound even worse. The installation was done properly