Item value Place of Origin zhejiang China Brand Name OTMAR Model Number OTM-F15 Gears 7 speed Range per Power 31 - 60 km Frame Material Aluminum Alloy Wheel Size 20" Max Speed 30-55Km/h Voltage 36V/48V/52V Power Supply Lithium Battery Braking System Disc Brake Torque 90-100 Nm Charging Time >3 hours Motor position Rear Motor optional dual motor Battery Position dual battery Battery Capacity 15AH /17.5AH/20AH Tire Width 20*4.0