Hey guys, I have a brand new one of these onyx 29" bikes I want to put an engine on it but I'm not interested in any friction drives. I'm looking to find out what kind of engine options I have and any foreseeable difficulties that member may see with my frame choice. I'm partial to the onyx personally because I saw a guy who had one done. It looked like this after. Anyone know which direction I should go to get started or things to avoid?