While most sport bikes and cruisers start at 250 cc in the US, the dual sport bikes come in a variety of sizes starting from the 50 cc youth bikes. The dual sport tires let you ride in mud or snow. First is to optimize the gear ratio to your terrain. Next is to work on a front and rear fairing system including a front fender closer to the wheel. The tail box gets the backpack weight off your shoulders. See in the Motorcycle/ Scooter and the Aerodynamics sections. There threads for streamlining motorcycles. Sendler's CBR250 tail box is a good example.
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