I was going to buy a trike from Germany, because here in Finland they're just so effing outrageously expensive. I need it for safe winter riding and for hauling groceries.
I realized, by seeing some bicycle to tricycle conversion kits, that I could convert a beater frame into a trike with a bit of mumble mumble and few spare parts.
One result of the mumble mumble is that I realized I need wheels/hubs with full axles (not QR-type). I am fairly sure I could get a pair of used 26" rear wheels with bolt-on axle hubs.
Now, I have two options: have a long solid axle common to the two hubs, and freely rotating. In this case, I should have a cog/freewheel/sprocket on each hub, and drive them separately in some way. Doable, but complicated.
The other option derives from the previous one: same as before, but the axle is not rotating in the hubs: the cups are somehow jammed (remove the ball bearings and replace them with some kind of washer(s) and/or bolt. The axle would then be rotating inside a couple of cartridge bearings on which the rear cart and rear dropouts would rest. In this case I would only need to drive this axle. But how do I mount a freewheel on it? And how about a discbrake rotor?
Also, any random thoughts that come to your mind, please share. BTW, I am determined to do this myself and not buy a ready conversion kit. I know some will feel the urge to say "just buy this existing kit". I am not going to spend $450 on this kit (cheapest quote with shipping, not even including customs and taxes).