This was from the mid 1990's crop of high end "hybrid" bikes that never really gained momentum. The tires are 45mm wide and just barely fit which makes it hard to argue that these bikes were early 29" wheel bikes. We got this one as a frame and had to build it up with period parts. We had the wheels laying around and didn't really have a good bike for them.....so here they are!
More details at http://mombat.org/1995_Mountain_Goat_Route66.htm