Combine Nexus 3 Hub with Torpedo 3 gear shifter? I have upgraded my bike with a Nexus 3 hub, but the corresponding gear shifter takes away too much handle space on my crooked handle bar (I have to grab the gear shifter during my rides). Hence, I'd like to use a more flexible gear shifter that can be installed everywhere on my handlebar, as e.g. the classic Torpedo. I am wondering whether these are compatible.

Many thanks in advance
According to Sheldon Brown's exhaustive list, the Shimano is fairly close to the two hubs that use the Torpedo shifter. Shimano wants 14.2mm of cable pull between gears 1 and 2 where the two Torpedo-compatible hubs want 14.0mm and 13.8mm, then between 2 and 3 it's 7.8mm vs 8.7mm and 7.7mm, which suggests that the tolerances on the hubs are sufficient that you should be able to find and adjustment that works reliably.

HUB                  -&gt; mm of cable pull                      
Shimano 3-speed Nexus IG    14.2   7.8
SRAM T3                     14.0   8.7
SRAM i-motion 3             13.8   7.7
Sturmey-Archer 3-sp trigger 14.2   9.5


The Sturmey-Archer trigger might work, but you might find it over-tightens the cable in top gear.

You could also use a handlebar-mounted friction shifting lever like this:
 

This question about the differences between the various Sachs/SRAM hubs might also be useful to read.