SR SD021.01 Ebike Speed Sensor Assembly, Wheel Speed Detector Sensor for Bafang M Series Mid-Drive E-bike Motor

SR SD021.01 E-bike Speed Sensor for Bafang Mid-Drive Motor

SR SD021.01 speed sensor is the original wheel speed detector for Bafang mid-drive e-bike systems. Adopts double hall sensor design, paired with magnet unit to capture wheel rotation signal. The controller calculates riding speed based on rotation pulses and interval time. It complies with EN15194 safety standard, perfect for replacement and repair of Bafang M series mid motor e-bikes.

Compatibility

✅ Works for Bafang M series mid-drive motor systems

✅ Compatible with Bafang BBS01(M215), BBS02(M315), BBSHD(M615, M625) mid drive motors

✅ For e-bike conversion kits, spare parts replacement and maintenance

Precise Parameters

Package Includes

1 × SR SD021.01 Speed Sensor 1 × Magnet Unit M512 Phillips screw, M46 Torx screw & end cap

Only the above package content, other products are not included.

Key Features

✅ Dual Hall Stable Signal Detection: Double hall sensor design ensures reliable signal capture, meets EN15194 safety requirements, reduces signal loss during riding.

✅ IP65 Waterproof & Wide Temperature Range: IP65 waterproof construction, works reliably under -40℃~125℃, adapts to various outdoor riding environments.

✅ High Strength Housing: Sensor body made of PA66+30%CF reinforced nylon, cable with PVC sheath, wear-resistant and long service life.

✅ Simple Installation: Mount sensor on rear fork and magnet unit on spoke, keep 10-20mm clearance between sensor and magnet. Comes with all required mounting hardware.

✅ Direct Replacement Part: OEM spec speed sensor for Bafang mid-drive e-bike, plug and play, great for repair shops and DIY e-bike builders.

Specifications

• Product Name: SR SD021.01 E-bike Speed Sensor Assembly
• Model: SR SD021.01
• Waterproof: IP65
• Power Supply: 5±0.5V
• Sensor Type: Double Hall wheel speed sensor
• Application: Wheel speed detection for Bafang mid-drive e-bike system
• Package: 1 × Speed Sensor + Magnet Unit + Mounting Screws & End Cap

Important Notes

• Maintain 10–20mm clearance between speed sensor and magnet unit during installation.
• Do not contact magnetic materials to the sensor and magnet unit.
• Avoid heavy impact or knocking during transportation and installation.
• Do not use under long-time overload or wading condition.
• Please confirm your Bafang mid motor system before purchase. Motor, display and other e-bike components shown on reference images are NOT included.

Ideal spare part for e-bike repair stores, DIY retrofit enthusiasts and ebike wholesale distributors. Reliable wheel speed sensor replacement for Bafang M series mid-drive e-bikes.