Videre non videri
Join Date: Sep 2004
Location: Gothenburg, Sweden
Posts: 3,208
Bikes: 1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
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The Rohloff hub has a lower gearing limit set to 2.4:1. That means your lowest possible gearing is a 15T sprocket with a 36T chain ring. Go below that, and you void the warranty, and you risk wearing it out much faster, I assume.
That combo gives you a range from a low of 17 gear inches to a high of 90 gear inches.