What I do not think you realise, GrumpyGregry, is that Brompton developed the 2x3 speed system precisely because SA did not exist! Having lost the use of the SA5, the only other hub gear available to fit the existing frames was the Sachs Torpedo, with modification, on which the 2-speed derailleur was then added. It is only since the acquisition of the SA patents by the current company that the SA hub came back into existence. You now have the SA8 fitted to your Brompton, but I doubt very much that the dropout is still 110mm; more likely it is wider, probably 130mm. I also know of Rohloff 14-speed Bromptons, but, like your Brompton, the dropouts have been modified, so are no longer standard. You should therefore not disparage the marvellous efforts of Brompton to overcome the lack of a multi-geared hub when left bereft by the collapse of the original SA company. Nowadays there is quite a choice of these multi-geared hubs, but mostly they are built with 130 or 135 mm widths and can only be slimmed a bit.
