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I have ridden single speed and fixed for over 20 years now and have a bit of a hatred for standard mechs....so I built my last 29er with an alfine and belt drive years ago. I love Belt drive, which limits me to either single speed or hub gear anyway.
Derailleurs just look really crude to me compared to enclosed systems. I also hate the noise and slap of chains off road. I'm just a fussy fucker these days. :)
Why the hub gears, out of interest?