Old 02-09-11, 07:58 PM
  #23  
fietsbob 
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I've been running the AW3 made in 94, in my Brompton , with a Schlumpf Mountain drive,
(Ref #6) Florian has a model that has a torque arm that sits on top of the BB/Rear Hinge plate.

For regular bikes , he makes a different torque arm, uses a strap around the chainstay,
like a coaster brake but of course for the bigger diameter of the big end of the chainstay tube.

http://www.schlumpf.ch/hp/md/md_engl.htm

They have been made for a long time ,, seems AW3 is pretty robust,
where Rohloff has Needle bearings,
the Planetary gears revolve on hardened steel pins, in a Sturmey hub,
and the other parts in there are tempered steel too ..

6 gear ratios , of course the lower 3 are closer together ..
though the % between them is consistent.

Last edited by fietsbob; 02-09-11 at 08:02 PM.
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