Bosch rim magnet
Here you'll find an overview of the best Bosch rim magnet tuning solutions – specifically for Bosch BDU37 (Gen4) and BDU38 (Gen5) motors. Without the need for an app, chip, or software, you can technically remove the pedal assistance limit with a targeted modification of the speed sensor and magnet.
The principle is simple: You move the Bosch sensor and replace the spoke magnet with a rim magnet. This means the system detects fewer Impulse – and your e-bike thinks it's going slower than it actually is. This is a clever way to circumvent the 25 km/h speed limit – purely mechanically, without interfering with the motor control system.
Rim magnet tuning works particularly well with:
• Bosch Performance Line CX (BDU3741, BDU3740) = Gen4 / BES2
• Bosch Smart System (BDU3780, BDU3781) = Gen5 / BES3
The solutions are based on proven principles such as RimBoost or the Badass Box – but are completely wireless, unobtrusive and often retrofittable.
