"I am not positive, but there is a very good chance that bike needs to have a Dahon specific rear derailleur. It also requires a Dahon specific headset and folding stem that is not going to be super easy to get."
"I am so confused by this post.
So even though biking is WAY better than it was say 5 years ago you have recently become scared of it because cars are on the road?
Sounds more like you are getting tired of biking andd looking for excuses than there…"
"Putting your lock on your handle bars, if you have any brakes or shifters on it, is a terrible idea and not exactly great for your bike. It also leaves you lock somewhere it can shift around and get wedged somewhere or effect the functionality…"