John: I wanted to also say if you are riding only 50 miles a day, you have plenty of time to get off the step and take posture breaks. That is not alot of mileage in terms of touring... when I toured it was not uncommon to ride 85 - 125 miles a day and sometime I would approach close to 200... day in and out. It all about just getting into a proper cadence and turning the pedal (and not being able to find a good camp site)... just do some saddle time before you start; work up those butt calluses. BTW my butt is never an issue, most of the pressure when i ride is around my groin area, promdominately on the left side (where I tend to "sit). I've had to learn to adjust my placement on the saddle - going forward and back and do that often as to avoid pressure sores...
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