Hi guys, thank you so much for your answers so far. This all sounds like some really great tips.
@John: Searching for state specific bicycle maps was a good hint. I already found some promising maps. The downside of those (compared to the ACA maps) is of course they do not have turn by turn directions. But I guess no other maps have this. I think I'll try to plan with routes that are covered by ACA as much as possible.
@Juan: Never in my life I would have thought I meet somebody who is not from Butte who knows this. When I lived there the pop was 453 (incl. me); thats a little less than Frankfurt, yes
Thanks for the hint regarding the month of depature. I have the luck to work with a big firm that offers to take sabbaticals, so I'd guess I am flexible on when l take off. I will definitely take a look on your page as well!
Regardign the trip: I was even thinking about applying for a Visa, just to be on the safe side. But I think 90 days should be feasible as well.
To be honest, I am not an experienced biker at all. The thought of doing a cross country trip in the US struck me when I stumbeled across a video in Youtube and I could never let go of the thought since. This was 10 months ago. A couple of weeks ago I realized I want to do it.
I made an 8 days ride last summer and did 570km (ca. 356miles) without any kind of problems. I will do lots of trips this years to test my physicle and mental strength
I also already bought a tent (Big Agnes Copper Spur) and plan on slowly building up on the equipement side throughout the year.
Thanks again for all your help guys!