Newbie questions on Dahon D7
I am very excited because I just got my Dahon D7. I am ok with the pea soup color, looks modern. Some dumb questions ( keep in mind my previous bike was a $50 walmart bike):
1) Ill be using it a lot in Chicago downtown, should I lock it up folded or not? I have a cable type lock from Master, should I get a better one? How likely is it for someone to steal a bike from a populated area during the daytime ( my guess is small, but who knows )?
2) In the rear there is some little button with a spring in it that you can push in, what is that for?
3) In the front wheel there is also a quarter size coin-shaped attachment, can not figure out what it's for?
4) I have been lugging my baggage by just using the elastic strap to tie it to the rear rack, but it is not stable for wide loads > 10 inches. What options do I have for that?