x32792
Adventurer
Although I would love to run the trail on my motorcycle, I ride a 250cc bike because I like to keep the weight down for the terrain I ride and it would NOT be a good choice for a trek of that distance. I'm not inclined to purchase a new bigger bike specifically to make the trip, nor do I quite travel light enough to do the route on a bike. My Tacoma, on the other hand, would be at home making the trip.
I think you need two motorcycles or two 4x4s to run the TAT.
On the Eastern portion, which is the easiest section, my vintage and unmolested Jeep was up to the task except for a single 1/4 mile or less patch in AR.
For the Eastern portion, something like a big comfy KLR650 or BMW is the ticket....BUT when you reach Trinidad, CO, (ideally) you should re-fit...
West of Trinidad, you'll need more Jeep than I had and a lighter bike. On the bike side, something like a DRZ400s or new Yamaha WR250R...bigger (and heavier) bikes will beat you up and wear you out the further West you travel on the TAT.
IMHO, the whole TAT is too much to do at one go in a 4x4 or on a bike.
Many have opted to do the TAT in sections (or by States), store their bikes and then re-deploy later to capitalize on the best weather conditions. I was lucky with the weather and think it is unreasonable to assume Mother Nature isn't going to kick your butt somewhere along the 4,400 mile TAT if you try to do the whole thing at one go.
John