I am planning on the MT 21s. I need to do some mileage tests this summer, but for the gravel and such here in Montana they are amazing. I can run my monster at scary speeds on the backroads here, and gravel and mud seem to have minimum impact. I plan to run different tires for the ride home, but that will be almost all paved. Granted my bike is smaller than a lot of those running, and I am not sure how it compares weight wise to the KTMs. Just my two cents.
"If you're in control, you're not going fast enough." -- Parnelli Jones