Ah. OK, thanks for reminding me. One other design quirk of the Speed Pro TT I forgot to mention.

Original setup, which I still have, is a Shimano drivetrain w/Tiagra brifters & Ultegra RD, with the left brifter shifting what I remember as a SRAM 3x internally geared hub.

Now I'm a mechanic and keep that IGH chainbox aligned as best I can. Still, there are times when I try to shift the hub gear with the left brifter and find myself spinning wildly in no-man's land, as the IGH gets stuck between gears. Very annoying.

I couldn't figure out why this was happening, so I did a little research, and found that Shimano does not necessarily recommend using any brifter with an IGH because the cable pulls can be ever so slightly different. That's exactly what happens to me no matter how I tweak the chainbox alignment. I'll set it precisely, ride some and then it creeps up again. I've tried replacing the cable with no effect.

I could replace the left brifter with something that would shift the IGH better, say a bar-end shifter, but that would be tough with the Dahon's bullhorn bars, plus I'd still need the left brifter for braking unless I replaced the left brake lever too. All that would look plenty strange on this bike assuming I could do it at all.

I don't see myself keeping this bike long-term unless I find a solution for this.