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@Velocio
Because the Gates sprocket for Rohloff is 19t.
Yet the smallest Gates sprocket for single-speed is 20t.
So if I want to use the same belt and front beltring for both Rohloff and single-speed, I''d be screwed as I don't have that much space in my drops to tension a difference of 1t and I would like to keep the Rohloff direct drive gear (#11) to the same as my single-speed gear (approx 74.5 gear inches).
So... I need both a 20t Rohloff sprocket and a 20t single-speed sprocket to allow for the swapping of wheels without swapping anything else.
Phil Wood do the Rohloff sprocket as a 20t one, which means that if I go for the Phil sprocket I can run 55/20 and get the same GI on both the Rohloff direct drive as the single-speed.
All make sense?