Ridstar Q20 Mini Electric Bike 48V 15Ah 1OOO -Watts Fat Tire Mountain 20" E-Bicycle – Ultimate All-Terrain E-Bike for Commuting and Adventure. Key Features of the Ridstar Q20 Mini Electric Bike Heavy-Duty Load Capacity : The Ridstar Q20 can support a maximum load of300 lbs, making it suitable for riders of all sizes.