Model Number: V01 Brand Name: Veloup Key Specifications/Special Features: Veloup smart drive system for electric bikeThe VeloUP Smart Drive System has been contributed by 4 working sectors, being respectively: the Sensors, the battery, the motor as well as the interactive unit.Sensors: the sensors are equipped onto the bottom bracket for the detection of torque value, pedaling frequency as well as speed; the main controller with the integration of the sensors may determine with accuracy the rider’s intentions and road conditions.Motor controller: the motor controller, which is integrated in the battery base, regulates the power output with an advanced bionic algorithm that produces the result with a response of millisecond and a safety-ensured speed in microseconds.Batteries: the batteries are available in three structure selections, namely kettle battery box, rack battery box, tail-attached battery box. in order for the best adaption to various types of bicycles, the capacity of the battery can be selected between 5.2Ah – 10.4 Ah accordingly.Motors: The motors are to be selected from the types of rear cassette type, rear screw type and front motor with 2 rated power types for options (180W/250W) for the best adaption to various types of bicycles.Interactive unit: There are two types of interactive formats to be chosen. The interactive unit can be used for the communication with the system, adjusting the changing gears and power output modes as well as the display of real-time information of riding speed, battery level as well as output power. B.B Sensor Specification Type Torque Sensor, Pedaling Frequency Sensor Input 5 DCV Output Signal: Digital Signal (CAN/LIN/UART/RS485) Resolution Ratio 0.0001N.m/bit Operating Temperature Range -25℃--60℃ Bottom Bracket JIS BB Diameter 45.5 mm BB Width 68mm Mounting Position Bottom Bracket Chain Central Point 47.5mm/51mm BCD Value 130mm IP Code IP 65 Certificates EN 15194/JIS/FCC