Original disc brake mounted speed sensor exclusively for Bafang M410, M510, M560, M600, M630, M820 mid-drive torque motors. Designed for disc brake e-bikes, features non-contact Hall induction for precise wheel speed detection, plug-and-play EB-BUS connection. Frame structural compatibility is mandatory before installation, only fits frames with reserved mounting space on rear chainstay/disc brake caliper position. IP65 waterproof, durable PA66 plastic housing, complete with fixing magnet and hardware kits for direct replacement or new build conversion.