
I currently have an SA CS-RK3 dual drive IGH on my Nazca Paseo. In operation I quite like it, but in reality a shift of the IGH is only equivalent to 2 sprockets on a cassette. And unlike a Rohloff you still have to plan which ratio to stop in anyway. Broadly speaking a 1x11 gives the same function as a 2x9 and I think I can live with that by sacrificing the rop end.
As it happens I have a Mavic Crossride with an 8/9/10/11 speed compatible hub. Using that and switching back from a disc to a V-brake is going to save quite a bit of weight. Along with a lighter tyre (less worried about changing punctures than with the IGN) and the 1x11 gearing I reckon a weight saving of about 3-4 lbs which would be noticeable.
I'd probably run an 11-42 cassette in the first instance. Anybody used an 11-42 on a Nazca?