Any Ultra Runners retired that turn into the ultra mountain biking? Or anybody gone great distances without a huge background in cycling?, I  have back-to-back 200 mile distances for the past two years is it conceivable for me to attempt the GTR this coming summer I would think anything within the mind is conceivable but is it realistic I live on Maui so there's not a lot of single-track trails but I can start to do some adventuring on my, doing a few hundreds or centuries on my bike  multiple West Maui Loop don't know just looking for another Outlet as I like being out there a long time, bike its a 2005 roubaix specialized carbon is it possible to turn that into a GTR bike backpacking bike or do I need to drop some money on a mountain bike Mahalo for your time and inspiration PMA