Fantic 200 rear wheel off set. in Fantic Posted June 15 · Report reply Evening all. I have two rear wheels from a fantic 200 with the conical hubs. I'm about to rebuild one of them but currently they have slightly different off sets? One is 42mm (measured from the non sprocket side) and the other is 43.5mm? I can't find anything definitive web wise so I just wondered if anybody knew the correct measurement. I've tried accurately measuring from the swinging arm to both sides of the wheel but as the swinging arm is round it's proved a bit hit and miss at best! Thanks in advance.