Originally Posted by
Dahon.Steve
I believe Brompton choose it's current 6 speed configuration when it could not source the 5 speed due to Sturmey Archer's demise. Now that the 5 speed is back, they should drop the six speed altogether.
I seem to recall reading is was to save weight;the 3spd hub + 2spd der setup is much lighter than the 5spd hub.