ITEM NAME:Electric Bicycle Pedal 12 Magnets E-Bike Pas System Speed Sensor A1F8 Electric Bicycle Pedal 12 Magnets E-Bike Pas System Speed Sensor A1F8 Electric bicycle speed sensor (known as PAS, wheel mounted sensor). It is a high-tech component designed for electric bicycle with ergonomics. It has superiority to match well with all electric bicycles available in the market. It employs the dual-magnetic loop - Hall elastic angle difference to detect the dynamic torque, which is converted to DC signal and sent to the controller. 1:1 power assist. Make cycling easier and funnier. Magnets: 5/8/12(Optional) Disk Diameter: Approx. 65mm/2.56 inch Steel Ring Diameter: Approx. 35mm/1.37 inch Cable Length: Approx. 1.1m/43.3 inch Weight: Approx. 50g Color:black Material:metal Size:35mm Package Contents: 1 * Electric Bicycle Assistant Sensor