Thats a custom steel Hunter 29er
www.AsanaCycles.com

here's another... with big tires, I rode this bike for about 2yrs straight. I've had it for 5yrs now.

26x4.0
at 30psi the tires are really hard, and they roll really fast
at 5psi thet tires are really soft, and they roll over really soft surfaces

everything in between, is just that... adjust psi accordingly