Bike Anti-Porn - When Things Go Wrong

You fit the beltring onto a standard crankset, so the Q-factor s unchanged. Although in order to fit, some frames would need the chainstay crimping, because the thicker beltring. So I can see were the Q-factor issue could come from.

The District uses a 135mm rear hub.
Fixie Inc's flip flop belt pulley compatible hub system thing is gonna be 135mm.
So yeah, wider Q factor than 120mm rear spacing fixed bike but no wider than mtb/road/hybrid.
Think the b/b on the district is about 118mm so you can get an idea of how wide things are gonna be.
Pity that the District frame has a retardedly low b/b height, esp considering the 2nd and 3rd chain driven Districts come with a flip flop hub and they all use 175mm cranks.
The District frame is pretty crap actually. Really flexxy which causes problems with belt alignment and rubbing.