My REAL Dahon problem is that I can't my Speed D7 shifting properly. The problem has defied two bike shops and my buddy who is a pro bike mechanic. If the Speed was a more expensive bike I'd just start swapping out parts and so on, but it's low cost enough that it's hard to justify replacing drivetrain parts in the hope it will solve the problem.

For the time being I got in working in 1 gear and treat it like a single speed!