SpeedFun for Bosch Performance Line CX Smart System – Rim Magnet BDU38

NOTE: Conventional tuning modules offer only limited functionality compared to today’s e-bike standards. They often rely on complex and unintuitive display button sequences for activating, deactivating, or adjusting speed limits. This makes operation cumbersome, especially during a ride. In some cases, users must stop the bicycle and manually rotate the rear wheel multiple times to initiate or confirm the selected setting — a process that is inefficient and inconvenient for real-world riding conditions.

Feature	❌ Conventional Tuning Chips	✅ EPAspeed B.Tuning
Setup & Activation	Complicated button combinations, easy to forget	Simple app control — activate or deactivate with a tap
Speed Limit Adjustment	Requires rotating the wheel or entering complex codes	Instantly adjustable in the EPAspeed app
Firmware Resistance	Easily disabled after motor or display updates	Fully resistant to OEM firmware updates
Display Compatibility	Often shows wrong speed or altered speed	Preserves full speed and distance accuracy
Installation	Wired directly into display or motor — risk of detection	Contactless design — no software interference
Bluetooth Functionality	Not available	Built-in Bluetooth — control settings, monitor stats, set limits
User Experience	Outdated, difficult to use, and not intuitive	Modern, seamless, and designed for real e-MTB riders
Safety & Reliability	Risk of error codes, firmware lockout, or damage during updates	Engineered for long-term reliability with non-invasive integration

In contrast, the EPAspeed B.Tuning series represents the next generation of e-bike tuning — fully app-controlled, firmware-resistant, and designed for effortless operation. With Bluetooth connectivity, intuitive controls, and invisible tuning functionality, EPAspeed delivers precision, reliability, and freedom unmatched by conventional solutions.

Key Features
• Tuning Control – Instantly activate or deactivate tuning
• Adjustable Speed Limits – Set your preferred maximum assistance speed
• Invisible Tuning Mode – Undetectable operation for smooth and safe performance
• Trip Recording – Automatically save and review detailed ride statistics
• Comprehensive Ride Data – Monitor distance, duration, average & max speed, and elevation

👉 Click here to view the EPAspeed 1.4 B.Tuning for Bosch 

WARNING: 

before purchasing this device, it is necessary to check the “product code” of your bosch performance line cx / sx motor.
the “product code” is shown on the motor label.
in the example the two types of label used by bosch are visible and the “product codes” of the motors circled in red.

performance line sx bdu314y - manufactured from 2023
performance line cx bdu374y – manufactured from 2024
performance line cx bdu384y – manufactured from 2025

This speed release device is compatible only and exclusively with Bosch Performance Line CX (BDU38) motors equipped with a magnet on the valve (Bosch Rim Magnet) regardless of the display or handlebar control.

SpeedFun for Bosch Performance Line CX Smart System – Rim Magnet  BDU38

All SpeedFun Furious Evo speed release devices can be activated and deactivated at any time and connection to the light output is not necessary.

What is SpeedFun Furious Evo tuning for Bosch Smart System?

The function of the Furious Evo tuning device for Bosch Smart System is to electronically manipulate the rotation speed of the rear wheel and to communicate to the motor a speed always lower than 25 KmH in order to obtain a real speed with a very high active motor. The maximum speed limit will therefore be dictated by the power of the engine added to the power expressed by one’s legs.

This speed release device is compatible only and exclusively with Bosch Performance Line CX (BES3) motors equipped with a magnet on the valve (Bosch Rim Magnet) with LED Remote/System Controller command (also compatible with Led Remote + Kiox 300/500, Intuvia 100 or System Controller + Mini Remote) or Purion 200.

When the device is active, the display will show the exact speed up to the threshold of about 20 KmH, beyond which a manipulated speed will always be shown below 25 KmH.

SpeedFun Furious Evo is supplied ready to use, plug and go, can be activated and deactivated at will and maintains the setting even after the ebike is turned off. It can be installed easily thanks to the compatible connectors.

The kit includes all the elements necessary for installation, thus guaranteeing extreme ease of assembly.

All these elements have been specifically designed and created by us to guarantee correct placement of the parts during installation phases and avoid malfunctions over time or inconveniences during your riding.

Since these parts are made internally at our company. company have been specifically designed to best fit the Bosch Performance Line CX (BES3) Smart System engine.

ATTENTION 
This device is not compatible with ebikes equipped with a “classic” magnet on the spokes or brake disc. 

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

INSTALLATION MANUAL

https://radpolster.com/wp-content/uploads/2024/06/Istruzioni-FURIOUS-EVO-EASY-BOSCH-RIM-MAGNET-IT-EN-FR_compressed.pdf