I just shipped my Dahon Speed (7speed) from Shanghai to Taiwan and the chainring was bent in the process. Is this part something that I can get in any fairly good bicycle shop or is it a part that I have to go back to Dahon for? Also, there are some very small chips in the paint on the underside of the tubes of the bike. I was in a toy store and noticed that they sell a paint for models that is identical to the baby blue of my Speed. Can I lightly sand the chips, paint them with this paint and then put some kind of acrylic (marine grade) over it? Also, my first gear is so low that I never use it. Can I replace the front gear with a gear that has 3 or 4 more teeth?