Start with the actual route
Adventure motorcycles and smaller dual sports overlap, but they solve different problems. A larger bike may carry a comfortable highway approach and luggage well. A lighter bike is easier to manage in technical sections, sand, mud or repeated recoveries.
The best choice depends on the hardest section you intend to ride, your ability to lift and repair the machine, the connecting pavement and the distance between fuel stops.
Look past the published distance
Consider loaded weight, tire choice, ground clearance, gearing and the availability of parts. A route with long remote gaps rewards range; one with rocky climbs rewards manageable mass and traction. Riders traveling together should plan for the least capable bike and least experienced rider.
Optional hard sections are options. Review the official route notes and bypasses before the day begins so a safer choice does not feel like a defeat at the trailhead.
Practice the problems before departure
Ride the loaded motorcycle on terrain resembling the planned route. Practice low-speed turns, stopping and starting on a slope, a tire repair and picking up the bike with the luggage attached. Adjust the kit after that rehearsal.
If the trial day exposes a mismatch, shorten the route, choose a bypass or change the machine. A good ADV trip is one the whole group can finish safely and still want to repeat.