Ti Parts Workshop do a rather nice 3 speed kit with titanium sprockets and (I think) an aluminium replacement lever. Picture here.
I fitted the same hub on a Moulton f-frame. Also had tension/gear selection issues. Spent ages trying to get it sorted, however after a little use I still couldn’t get the lowest gear and the others were skipping. The best I managed was 4 of the 5 gears. Not good enough.
Personal opinion is that the modern Sturmey 5 speed is a bit shite. Converted the Moulton to a single speed (fine for where I am in London) and will either get a Sturmey S5/2 for more gears or another bike.
Super Brompton btw.
I think I'll persevere with it for a little longer, although the gear selection issues are a tad annoying. I really don't want to have to rebuild the rear wheel unless I absolutely have to though. I've already got a massive backlog of wheels to build without adding to it!
Ti Parts Workshop do a rather nice 3 speed kit with titanium sprockets and (I think) an aluminium replacement lever. Picture here.
I think I'll persevere with it for a little longer, although the gear selection issues are a tad annoying. I really don't want to have to rebuild the rear wheel unless I absolutely have to though. I've already got a massive backlog of wheels to build without adding to it!