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Amazon.com : Vivi M026TGB Electric Bike 26" Electric Bike for Adults, Folding Electric Mountain Bike with 500W Motor, 48V Removable Lithium-Ion Battery, 21 Speed, 20MPH, Up to 50 Miles, Dual Shock Absorber :
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MTM] 2N-m 24V electromagnetic power off clutch electromagnetic industrial brake without lever for motor - AliExpress
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