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Not a good idea to powder coat with bearings in as they wont like the 400 deg heat
The only way to get bearings is to tap from the middle, which renders them scrap on safety grounds. Sent from my X6pro using Tapatalk
Not if it pulls on the inner race, the bearings will suffer if you try, and will almost certainly fail prematurely if you re fit them. Sorry, but that's the way bearings are, the wheel bearings are not designed for sideways load.
Given the cost of bearings (about £6 a piece), false economy not to replace them into..
If you are really lucky and heat the hub enough but not too much then the bearing might come out really easily. On the other hand if you are not lucky the heat from powdercoat might distort the trued up wheel. Cannot say I have ever tried anything around powdercoating but I have a feeling that painting the whole lot up in 1 lump is going to end up being a false economy over painting each part and assembling. Given it's a cosmetic process I would be most worried about the paint cracking, chipping or flaking once in use at each point parts meet, let alone the disheartening effect if a spoke does need tightening after it's powdercoated together. Would work out more expensive if it all needs to come appart and be 're done. If I were just spray painting it I would risk it, less to loose.
Might be worth getting a set of spokes black anodized and have a go at lacing the wheels yourself. It’s not as hard as it looks. The hard part is truing them up...