I've got two motors that I've blown the bearings off of. I'm wondering what the bearing sizes are for the spektrum 3200kv motor (from a Typhon 3s) and a hobbywing max10 4000kv motor. if you need to see any pics of the motors i could upload some.
Usually I get good results just using search engine, and typing in something like "bearing sizes for spektrum 3200kv motor", or "bearing sizes for Hobbywing EZRun blah, blah, motor". Jim's Bearings, Boca Bearings are often showing up a lot in search results and Hobbywing's site has listed their motor bearing sizes. Jim's Bearings has a dropdown list of different brands of motors as well.
Also, maybe a little off topic, but those no-name lower budget motors that are out there... sometimes you just gotta crack 'em open and dig them out and measure.