I try not to have more than 4 to flip any any one time. More than that and I lose track of what parts came off what. I really need to get more organized. I have had 2 that I thought might have been stolen. One of those I ended up selling to a police officer....I didn't know he was until I was standing there with the bike and I was thinking "oh crap". But a week later he emailed me and said how happy he was with it.