I have a 1980 Schwinn Voyageur 11.8 which has been well maintained over the years. I have recently upgraded the drivetrain with a Tiagra nine speed hub which I built on a Sun CR 18 rim with double butted spokes. I would like to take a week long self supported trip which would require me to ride 70 to 80 miles per day. I would keep my load as light as possible. In your opinion would this bike be suitable although maybe not ideal? Are there issues with a 32 year old steel frame? A year ago I had a small crack in the seat stay where it connects to the down tube re-brazed. I am concerned that I might develop similar frame issues on the road? I appreciate any input you all may have.