Bosch Speed Sensor Slim 615mm Drive Unit - Bosch eBike System 2

The Bosch Speed Sensor Slim (615mm) is a precision electronic component designed for modern e-bikes, ensuring accurate velocity data is transmitted to the drive unit. This "Slim" version features a low-profile design for discreet mounting on the chainstay, reducing the risk of impact from trail debris. It is a critical part for maintaining legal motor cut-off speeds and providing a natural, responsive pedal-assist feel.

Equipped with a 615mm cable and a dedicated connector, this sensor offers versatile fitment for a wide range of frame geometries. It is essential to distinguish between versions, as specific models are tailored for either the Bosch Smart System (post-2022) or the Bosch eBike System 2 (Gen 3 and Gen 4). This hard-wired sensor ensures a stable connection for interference-free speedometer readings and optimal system diagnostics.

Quick Facts

Feature	Specification
Cable Length	615mm
Compatibility	Bosch Smart System (EB11.200.011) OR System 2 (1270020805)
Profile	Slim (Chainstay Mount)
Connection Type	Hard-wired with Integrated Connector
Function	Speed Detection & Assistance Regulation
Weight	Approximately 41g