Genuine Bafang SR PA 261.32.ST‑C Torque Cadence Bottom‑Bracket Sensor, Analog‑Signal Pedal‑Force BB Sensor for Compatible Standalone E‑bike Controller, Original Spare Part

SR PA 261.32.ST‑C is genuine original Bafang integrated external torque‑cadence bottom‑bracket sensor (BB = Bottom‑Bracket, bicycle crank spindle mounting shell). It outputs analog voltage torque signal (0.75‑3.2V) plus 32PPR cadence pulse signal. This sensor has no CAN‑Bus or UART digital communication protocol. Designed to pair with standalone ebike controller which explicitly supports this analog torque‑input signal for custom ebike conversion builds.

✅ Works with ebike system paired with standalone ebike controller supporting 0.75‑3.2V analog torque‑signal input + 32PPR cadence pulse

✅ Frame bottom‑bracket shell width: 120 mm

❌ NOT compatible with BBS‑series retrofit mid‑drive motors

❌ NOT compatible with Bafang M‑Series mid‑drive motors (M500/M510/M560/M600/M820, internal built‑in torque‑sensor)

1 × Genuine SR PA 261.32.ST‑C Torque‑Cadence Bottom‑Bracket Sensor complete assembly (lock‑rings and sealing gaskets included)

✅ Genuine Bafang OEM Original Part: Strictly follows factory specification, stable analog torque‑voltage output for natural pedal‑assist performance.

✅ Pure Analog‑Only Signal Output: No digital CAN‑Bus / UART protocol; outputs proportional analog torque voltage plus 32PPR cadence pulse for matched third‑party standalone controllers.

✅ Dual‑Signal Acquisition: Real‑time pedal‑torque measurement (0‑80 Nm) together with 32PPR cadence pulse signal.

✅ JIS Square‑Taper Spindle: Matches standard JIS square‑taper crank arms for common e‑bike frames.

✅ Threaded Installation: Complete assembly with lock‑rings and sealing gaskets for direct original bottom‑bracket replacement.

✅ IP54 Waterproof Rating: Reliable signal performance for daily commuting and off‑road riding environment.

Brand: Bafang

Product Name: Torque‑Cadence Bottom‑Bracket Sensor

Model: SR PA 261.32.ST‑C

Signal Type: Analog voltage 0.75‑3.2V + 32PPR cadence pulse (NOT CAN‑Bus / NOT UART digital protocol)

Crank Interface: JIS Square Taper

Frame BB Shell Width:120 mm

Total Length:200 mm

Cadence Pulse:32 PPR

Torque Range:0‑80 Nm

Input Voltage:4.5‑5.5V DC

Waterproof Rating:IP54

Installation Torque:40 Nm for lock‑rings

Certification: CE, EN15194

Application: Upgrade & spare replacement for ebike system with analog‑torque‑ready standalone controller

Color: Black

Package:1 × Complete SR PA 261.32.ST‑C sensor assembly

⚠️ Critical Pre‑purchase Check‑List

Minor color differences may appear due to lighting conditions and screen display variations.

Measurement tolerance ±1‑3 mm is allowed.

Only SR PA 261.32.ST‑C sensor assembly is included; motor, controller, crank arms, battery are not contained in package.

Perfect genuine spare & upgrade hardware for e‑bike repair stores, DIY motor rebuilders and ebike wholesale distributors. Adds true torque‑sensing pedal‑assist for compatible custom ebike conversion kits.

ck‑rings and gaskets; motor, controller and cranks are not included