6 is just not enough. I have a 18' 500 exc-f and it's not a bad compromise. Basically 5 gears for off road, and 1 gear for highway cruising. There is a big gap between 5th and 6th. My 16' 701 on the other hand is either too tall in 1st for technical off road, or too buzzy on the highway. Gears are spaced very evenly. I think the 500 has the better compromise in gearing for a dual sport, but ideally we need 7 or 8 gears. But that will add weight and size, neither of which we want, but you could say that about things like e-start too.