Description Ebike with Bosch Performance Line CX Smart System engine (gen. 4)-(Gen 4 BES3) – Rim Magnet What is the SpeedFun Furious Evo tuning for Bosch Performance Line PX (BDU347x) and Performance Line (BDU346x) Smart System – Rim Magnet? Compatible with the latest Bosch Drive Unit firmware version 19.54.0 that was released on May 4, 2026 as part of the major Performance Update 2.0 for the Bosch eBike Smart System. The SpeedFun Furious Evo tuning device electronically manipulates the rotational speed signal from the rear wheel and constantly feeds the motor a perceived speed below 25 km/h. This allows the motor to remain fully active, delivering assistance at significantly higher real-world speeds. The maximum achievable speed is therefore determined by the combined power of the motor and your own pedaling effort (info). When the tuning device is active the display shows the accurate speed up to approximately 20 km/h. Beyond this threshold, it displays a manipulated speed that is always kept below 25 km/h. This speed-unlock device is compatible exclusively with Bosch Performance Line PX (BDU347x) and Bosch Performance Line (BDU346x) equipped with the Rim Magnet (magnet located on the valve/rim). It works regardless of the display or controller unit fitted on the bike. SpeedFun Furious Evo is supplied pre-configured and ready for immediate use. It can be activated and deactivated at any time and it retains the last setting even after the ebike is switched off. Installation is straightforward thanks to the use of compatible connectors. The kit includes all the elements necessary for installation, ensuring extreme ease of assembly. All these components have been specifically designed and manufactured by us to guarantee the correct positioning of parts during installation and to prevent malfunctions over time or inconveniences during your rides. Since these parts are produced in-house by our company, they have been carefully engineered to achieve the best possible fit on the Bosch Performance Line PX (BDU347x) and Performance Line (BDU346x) Smart System motors.   ATTENTION! This device is not compatible with ebikes equipped with a “classic” magnet on the spokes or on the brake disc (see here). This device is not compatible with ebikes equipped with the Bosch ABS system. This device is not compatible with ebikes equipped with a GPS system (Bosch ConnectModule). Rim Magnet Chip Installation Guide