I was just a little concerned that with the...
... > front derailleur < could be more troublesome than the slick 3 speed internal hub.
2 things .. Brompton 6 speed is all on the rear.. BWR Hub 3 speed with 2 external cogs.
If you choose to retrofit of a Double crank , the 'greasy finger' shifting wont need a FD.
the heel of your shoe can initiate the down shift, rolling ..
when you want to return to the big ring, stop, put a rag on the chain, and put it back on the big ring, manually.
a picture of such a setup> http://www.flickr.com/photos/cleverc...n/photostream/
Last edited by fietsbob; 10-01-14 at 01:07 PM.