Mk 4 main frame is longer than the Mk 2. the inch was probably added 1/2 on each side of the hinge.
the new H stem did 30 mm on each side , this year , for a 6cm added height..
One issue I see in Brompton's P bar is the lower drops position for going down hill
and into a headwind, is there, but if you have to hit the brakes ,
you have to move your hands. UP to get to them ..
Last edited by fietsbob; 12-30-11 at 01:29 PM.