The STEPS Speed Sensor unit is designed for use with STEPS eBike drive units. The MTB dedicated design is robust and durable for rough trails. The clean and low profile design offers more space for wider tires. Compatible with the E8000, E7000, and E6100 series. Compatible with center lock disc brake freehub for 8/9/10-speed and 11-speed MTB or center lock disc brake for 11/8-speed internal geared hub. Magnet bracket only compatible with eBike speed sensor disc brake rotors RT-EM900, RT-EM800, or RT-EM600. Item Specifications: Color: Black, Wireless: No,