Yeah, bit of a niche market.
All I’ve found so far is a Lenz Spankster 29 x 3.0 http://www.lenzsport.com/Specifications.html with Rohloff dropouts. http://www.lenzsport.com/rev/singlespeed.html
Intense do a 29er VPP Spider and I’ve heard Santa Cruz will be doing a 29er VPP too in August. Both tempting as I currently ride a VPP BLur.
I’m not convinced fancy linkages really make any difference though and I like the idea of the constant chainstay length with the Lenz as it does away with the need for a tensioner
I’ve got a chance of a test ride on a Lenz Milk Money,like this http://www.velonews.com/photo/40731 as the guy at my LBS rides one with a Rohloff and he’s offered to lend me his own personal bike for a day.
I just thought I’d see what other options there are out there.
At £1800 for a frame and £900 for a Rohloff hub, this all depends on getting on Cyclescheme at work of course.