Bicycles progressed to lawn mower engine powered mini-bikes back in the 60's. Those progressed into dirt bikes in the 70's. Those had progressed into dual sports by the 80's. The first real motorcycle I can remember riding and when I learned to shift was on a Harley Davidson (Aermacchi) enduro. Somewhere along the way I figured out counter steering, threshold braking and all the other crap we need to know.
525EXC, 640 Enduro, XT200