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The speed required in the Vetter challenges of the 1980's was 55 mph. Most 50cc scooters don't go near that fast stock. See motoIQ.com for modifications to the Aprilia SR50 and the Honda Ruckus that boost top speed up to 58 mph. Engine mods involve porting and planing to get more power plus a larger bore and piston. The mods to the drivetrain involve different gearing and a clutch designed for racing. The question becomes how much drag reduction is needed to meet the present speed levels. The groceries can be stored between the rider's feet. See the Aprilia based cargo bikes with storage in front of the rider.
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