As to eligibility for IronButt status, it was originally only for those who competed in the rally, and then they found their numbers dwindling, so they opened the "IronButt" classification to anyone that completed a certified Saddlesore 1000 ( this was explained at this years annual banquet). The only competition that is restricted to two wheels is the rally, though I think you will see more restrictions in the future. I have done two saddlesore challenges in the last two months, and the Spyder is a forgiving platform for accomplishing this task. It allows you to carry more luggage than a traditional bike, and lets you get away with the addle minded mistakes that come with 18+ hours on a bike. The necessity for frequent gas stops is a true Achilles heel for using the Spyder, and handling at speed can be less than stellar. On my rt, I am lucky to get 22mpg at 80mph, so the gas stops come too often.
As to the seat question, the variables deal as much with your personal geometry (height, weight, inseam, how do you carry the weight etc) as it does the bike geometry. In my case, I needed a semi-firm seat with extra room for my big butt, along with 29" inseam, and desire for a seat rest. I ended up buying an ultimate seat because it was ready quickly, did not make me stay off bike for 4-6 weeks without a saddle, was moderately priced, and came with good recommendations. I also use a sheepskin covered gel pad that I switch on and off over the 1000+ miles. After 600 miles on any saddle, you will gladly sit on thumbtacks just for a different feeling. After 800 miles your ass is not your primary concern anymore, at least not the one you sit on! Hallucinations, knee pain, wrist pain, chapped lips, chapped face, hunger, thirst, time remaining for completion....these take up your time more. And your next gas stop. Especially on an RT!
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