Here is a slightly modied version of the riding that Cannonshot and I did out in the Black Hills last year. This was a Magellan file converted using GPS Babel into a garmin gdb file, then converted to gpx. There were almost 2000 track points and I deleted out a bunch of dead ends and such and got it down to about 1500, then broke it up into smaller track sections to keep the track files under 500 points. There are spots that we rode up to 3 times and the track shows it, sorry about that but I didn't have the time to figure it all out. These are all great roads and trails which can be ridden by larger bikes for the most part. The only section I'd avoid on a big bike would be the centenial trail between Nemo and Merritt.