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Bafang Assist Center Column Sensor PAS SR PA121. 32S New 2.0 Pedal Assist Sensor 68mm Electric Bike Booster Cadence Sensor
Bafang Assist Center Column Sensor PAS SR PA121. 32S New 2.0 Pedal Assist Sensor 68mm Electric Bike Booster Cadence Sensor - Image 2
Bafang Assist Center Column Sensor PAS SR PA121. 32S New 2.0 Pedal Assist Sensor 68mm Electric Bike Booster Cadence Sensor - Image 3
Bafang Assist Center Column Sensor PAS SR PA121. 32S New 2.0 Pedal Assist Sensor 68mm Electric Bike Booster Cadence Sensor - Image 4
Bafang Assist Center Column Sensor PAS SR PA121. 32S New 2.0 Pedal Assist Sensor 68mm Electric Bike Booster Cadence Sensor - Image 5

Bafang Assist Center Column Sensor PAS SR PA121. 32S New 2.0 Pedal Assist Sensor 68mm Electric Bike Booster Cadence Sensor

New 2.0 Bafang PAS pedal assist sensor with multi-size shaft options, fits standard 68mm BB. Lightweight 0.38kg design with PA nylon locking cap, precise cadence detection, eco-friendly material, perfect for Bafang ebike sensor replacement and upgrade.
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Bafang New 2.0 Version PAS SR PA Series Pedal Assist Center Column Speed Sensor

This upgraded 2.0 version pedal assist sensor is a professional dedicated cadence detection accessory fully optimized for Bafang electric bike systems. Designed for standard 68mm bottom bracket (BB) installation, it delivers precise, sensitive and stable pedal cadence detection, effectively improving pedal assist response speed and making daily riding smoother and more labor-saving. Multiple model and shaft length options are available to match different ebike frame sizes and component styles, realizing seamless integration with original Bafang motor systems. Adopting safe and eco-friendly raw materials without harmful chemicals, plus premium PA nylon locking cap structure, this sensor features compact lightweight design, easy installation and long-term stable performance, ideal for old sensor replacement and ebike system upgrade.

Compatibility & Scope of Application

✅ Standard 68mm Bottom Bracket (BB) Electric Bike Frames
✅ Full Range of Bafang Mid Drive Motor Systems
✅ Multiple Ebike Models Matching Different Shaft Length Specifications
✅ Direct Replacement & Performance Upgrade for Stock PAS Sensors

Product Specifications

Parameter
Value
Product Name
BB Speed / Pedal Assist Sensor (PAS)
Version
New 2.0 Upgraded Version
Applicable Standard
68mm Standard BB Bottom Bracket
Locking Cap Material
PA (Nylon)
Product Weight
0.380kg
Available Models & Shaft Length
SR PA112.32.S (127mm), SR PA121.32.S (119mm), SR PA131.32.S (124mm), SR PA142.32.S (136.5mm), SR PA172.32.S (132mm)
Core Function
Precise pedal cadence detection, smooth ebike pedal assist output
Feature
Responsive sensing, compact lightweight, eco-friendly, easy installation
Application
Bafang ebike sensor replacement, system upgrade and maintenance

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We supply genuine OEM parts and premium compatible aftermarket replacement parts for e-bikes, including motor components, controllers, throttles, PAS sensors, wiring harnesses, connectors and Bosch form-factor batteries.

We serve mainstream drive system manufacturers: Ananda, Bafang, Aikema, Tongsheng, Shengyi, Bosch and more. We also provide repair components for complete e-bike brands including Sur‑Ron, Aventon, Trek and many others.

All items are brand-new and inspected before shipment. We do not supply second-hand or refurbished goods.

Our team verifies compatibility according to your bike model, motor info or original part photos. We confirm available OEM parts or recommend workable alternative solutions.

Yes. Flexible order sizes are supported, ranging from single spare parts to bulk purchases.

Sea freight, air freight and rail transport are optional.

Lead time varies by item and shipping mode. We confirm exact timelines before each order and share tracking updates.

We provide part identification, model matching and full order follow-up support.