I bought a used SkyTeam Skimini (Monkey Replica) 4 years ago. Was with the all in all now already 2x at the TüV which had never anything to complain about. Now the chain including the pinion and chain wheel was worn, everything renewed and see since I had in front more teeth on it than is allowed. So did I drive the whole 4 years illegally? At the end with expired operating permit? I did not put the pinion on it, but the predecessor. So every time I buy a vehicle I have to disassemble it completely into all parts before I drive it? If the TÜV doesn’t even check it out, where do I want to be on the safe side as a layman?