velomaniac
MacRetro Rider
SJSCycles do offer an off the peg Rohlhoff specific mtb frame albeit in 26er spec and Bob Jackson cycles offer handbuilt frames with Rohlhoff dropouts.
69er or 96er if you prefer for less smutty reasons could be a good compromise.
Niner bikes are another good option for 29ers or GT's Peace 29er SS could be built up as a hub geared machine.
Currently ride a 28.5er fixie on and off road. The large balloon tyres help rolling over obstacles as wheelies on a fixie require coordination beyond the ken of mere mortals. Steering is slow and sedate but has no nasty surprises
69er or 96er if you prefer for less smutty reasons could be a good compromise.
Niner bikes are another good option for 29ers or GT's Peace 29er SS could be built up as a hub geared machine.
Currently ride a 28.5er fixie on and off road. The large balloon tyres help rolling over obstacles as wheelies on a fixie require coordination beyond the ken of mere mortals. Steering is slow and sedate but has no nasty surprises