2016-2017 Rook Colt Drop Out Torque Sensor

Drop-out style torque sensor for 2016-2017 Surface 604 Rook and Colt models. The torque sensor measures how hard you are pedaling and tells the controller how much electric assist to provide.

A failing torque sensor causes symptoms like no assist, intermittent assist, or assist that feels unresponsive to pedal pressure. Note: the current replacement ships as the 2020+ version with a green connector — this is correct and fully compatible with older models. A functioning torque sensor is essential for the natural, intuitive ride feel that Surface 604 eBikes are known for.