Bosch Disc Rotor Magnet - BDU3XX/BDU4XX

Name: Bosch Disc Rotor Magnet - BDU3XX/BDU4XX
Brand: Bosch
SKU: ver2p3diyh
Availability: InStock

The Bosch Disc Rotor Magnet is designed for accurate speed measurement on your e-bike system. This...

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Product Information

Full details

The Bosch Disc Rotor Magnet is an essential component for e-bike riders who rely on accurate speed monitoring for their BDU3XX or BDU4XX drive systems. Designed for seamless integration with 6-hole disc rotor setups, this original Bosch component ensures consistent communication between the magnet and the speed sensor, though it is exclusively compatible with specific Bosch drive units and requires precise alignment to function correctly.

All features

Series	BDU3XX/BDU4XX
Model Part Number	1270.015.728-VEO
Brand	Bosch

Extended Product Information

FAQs

Can I use this magnet with a center-lock rotor?

No, this specific magnet is designed for 6-hole disc rotors only.

Does the magnet position matter?

Yes, it must be mounted to align with the speed sensor mounted on the bike's chainstay to function correctly.

Is this compatible with older BDU2XX drive units?

No, this magnet is specifically engineered for the BDU3XX and BDU4XX series drive units.

What should I do if the magnet becomes loose?

Remove the magnet, clean the mounting surface, and ensure it is tightened to the recommended torque specification to prevent shifting.

Do I need to replace the magnet if I get new brake rotors?

If your new rotors are also 6-hole and the magnet can be safely transferred, you may not need a new one; however, ensure the magnet remains flat and secure against the new rotor surface.

Troubleshooting

Speedometer shows zero or fluctuates while riding

Check that the magnet is perfectly aligned with the speed sensor and ensure the gap is consistent and within manufacturer specifications.

Error 503 displays on your console

This indicates a speed sensor signal issue. Clean the magnet of any metal dust, confirm the sensor is not loose, and check for broken wires.

Pros and Cons

Pros

Ensures accurate speed sensor calibration
High-quality, durable Bosch construction
Seamless installation on 6-hole rotors
Optimized specifically for BDU3XX and BDU4XX motors

Cons

Not compatible with center-lock rotors
Requires precise positioning for optimal sensor response
Limited to specific Bosch drive unit series

Setup, Compatibility & Care

To install, secure the magnet firmly to your 6-hole disc rotor using the appropriate torque specifications provided by your rotor manufacturer. Proper alignment is critical; the magnet must pass within a few millimeters of the speed sensor on your chainstay to trigger it effectively. Check the gap regularly, as vibrations can cause the sensor to shift over time. Maintenance involves periodic inspection of the magnet for cracks or debris and confirming that the sensor cable is not pinched or frayed during the wheel installation process.