80 miles on a bike is a good work out but it is not that far. I think an average bike race is about 112 miles. Think of that as a marathon so an 80 mile ride would be like a 20 mile or so run, energy wise. I am sure most of you have hiked 20 miles in a day. Plus on a bike you can take your time and coast some if you want. Still not recommended for a beginner, saddle soar alone would deter me. Have a good one and maybe we can get together for a hang up around the AT. GLP you up for another try?