I am going to take my dahon to a shop to get the chainring and possibly crank arms replaced. I live in Taiwan and there is a sham that a lot of repair people use here - they will say "we don't know the sizes of xyz so we will have to take it apart and take a look at it", and then while your bike, computer, etc is in pieces on they table/floor they will quote a price that is too high, and most people will feel psychologically obligated to take it because the bike, etc is already in pieces.
Can someone tell me the sizes/materials, whatever that I need to ask for on my Dahon speed (w/ 7 speed rear cassette) so that they won't have to take anything apart? Also, is there a good post or link on materials and sizes for chain rings and cranks, crank arms? I have googled but get a lot of references that are mostly about the rear end.