Calibrazione sensore velocità CX

Bosch CX Speed Sensor Calibration | Complete Guide 2025

Accurate readings = Greater safety

A calibrated sensor ensures reliable data, correct assistance and safety on every trail.

When should you recalibrate?

After changing wheels, installing a new magnet/sensor, or if error E500 appears: always check the calibration!

Common mistakes

Incorrect magnet placement, wrong wheel setting, or missed reset — these are the most frequent causes of malfunction.

Optimise response

Correct calibration improves the smoothness of assistance and prevents sudden power cuts.

Procedural steps: Bosch CX speed sensor calibration
Step	Action	Tools	Notes/Warnings
1	Turn the e-bike system off and on again	Display, ON/OFF button	Make sure the battery is charged
2	Check that the magnet is correctly positioned on a spoke	Bosch original magnet	Accurate alignment with respect to the sensor
3	Ensure the sensor is properly fixed and clean	Torx key, clean cloth	No metallic interference near the sensor
4	Correctly set the wheel diameter via the display or Flow app	Display, Flow App	Follow Bosch instructions for your wheel (e.g. 29”=2320mm)
5	Take a short test ride, monitoring the speed	Bike, display	The speed shown should be realistic and stable
6	If error E500/E503 appears: repeat reset and check connections	Display, sensor	Check cables, clean contacts

*If in doubt, consult the Bosch manual or contact an authorised dealer.

Step-by-step guide: Bosch CX speed sensor calibration

Initial reset: Switch the bike off, then on again after 10 seconds. Ensure the magnet is mounted correctly.
Wheel diameter check: Via the display or Flow app, set the diameter exactly as per the Bosch chart (see manual).
Magnet positioning: The magnet must pass very close (max 2-3mm) to the sensor with every rotation.
Functional test: Take a short ride, check the speed reading (it should be stable and realistic).
Error handling: If error E500/E503 appears, check contact cleanliness, connections, magnet position and repeat the reset.

Useful resources: Official Bosch Manual · Bosch CX Error Table

Technical trail test

Calibration carried out on a rocky trail: speed remained stable even with varying surfaces and speeds.

Urban commuting

After replacing the sensor, the bike regained real-world accuracy and range in the city.

E500 error management

A reset and repositioning of the magnet resolved the error. The display no longer shows irregular values.

Chart: Speed reading after calibration

Frequently asked questions about Bosch CX speed sensor calibration

When should calibration be done?

How do you set the wheel diameter?

If the sensor does not work?

Does the sensor affect the assistance?

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