No front derailleur. 1x10's, 1x11's, etc.
Those are pretty expensive though. At that price, why don't I just get a Rohloff Speedhub, which has all kinds of advantages?
Possible issues with the SpeedHub:
Ways to make the Rohloff work with drop bars:
Extra costs, other than just the internal-geared-hub itself:
- shifter $300?
- wheel rebuild