Bafang PAS Bottom Bracket Sensor 68mm 32Pulse Torque Cadence Sensor for E-bike

Bafang PAS Assist Bottom Bracket Sensor —

Original Bafang PAS (Pedal Assist System) bottom bracket sensor, model SR PA131.32.S. It’s installed in the frame’s 68mm bottom bracket shell, detecting both torque and cadence to deliver smooth, responsive motor assist for electric bikes.

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Key Features:

• 2-in-1 Sensing: Combines torque (pedaling force) + cadence (rotation speed) for natural assist
• Standard Size: BB width 68mm, total length 127.5mm, fits most e-bike frames
• High Resolution: 32 pulses per crank revolution (32P/R) for ultra-smooth assist
• 6PIN Waterproof Connector: Purple CAN protocol plug, IPX5 waterproof, durable for all weather
• Stable Signal: Original Bafang spec, anti-interference, compatible with Bafang controllers
• Easy Install: Direct replacement for standard bottom bracket, no frame modification

Compatible Models:

• Frames with 68mm bottom bracket (most mountain/urban e-bikes)
• Bafang mid-drive motors & controllers (CAN protocol)
• Model: SR PA131.32.S

Specifications:

• Model: SR PA131.32.S
• Function: Torque + Cadence (PAS assist)
• BB Width: 68mm
• Total Length: 127.5mm
• Pulses: 32P/R (32 pulses per revolution)
• Connector: 6PIN purple CAN waterproof plug
• Cable Length: 500mm
• Voltage: DC 4.5–5.5V
• Waterproof: IPX5
• Certification: CE / UL2849 / RoHS

Package Includes:

• 1 × Bafang PAS Bottom Bracket Sensor (SR PA131.32.S)

Note: Only compatible with Bafang CAN protocol controllers. Confirm your frame BB width (68mm) before purchase.