In reply to SWalls:
are you coming down Ruta40 from the North?
We tried to take the backroad to El Chalten from Chile: Ruta 7 south from Chilechico via Villa O'Higgins and a boas trip across Lago St Martin... no bikes tho - and public transport was just too time consuming / unreliable.
Much more interesting route, but it's ripio all the way.
Probably worthwhile taking a trip north up the valley from El Chalten just to get into the proper "deep Patagonia"....