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Most motorcycles have 4-5 inches of ground clearance with a wheelbase of 50-55 inches. My Geo Prism/Corolla has 9 inches of clearance. My bicycle has 3 inches clearance with the pedal at the bottom. If the ground clearance is 10% of the wheelbase I would be satisfied for street use. Suspension travel and spring rate are critical. With a lower center of mass you would have less weight transfer under braking. I hope the motorcycle aerodynamic thread is helpful.
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