KT BZ-4(8) (SM)
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The most common cadence PAS sensor in the e-bike conversion market. 8-magnet disc mounts on the bottom bracket spindle with a clip-on single Hall sensor, producing 8 pulses per pedal revolution. No crank removal required — installs with zip ties. Compatible with virtually all e-bike controllers including KT, Bafang UART, and generic Chinese controllers. 3-wire interface: 5V power, ground, and signal.
In brief: Cadence pedal assist sensor. 8 pulses per revolution. From $4 across 2 sellers.
Specs verified Sep 27, 2026
Where to Find
Prices tracked across 2 sellersAliExpress - Cycling Accessories Specialty Store
$4.11 + $1.99 shipping
AliExpress - HUDAMZKY-YUN Ebike Accessories Store Store
$8.93 + $1.99 shipping
* Shipping estimates are for the contiguous US and may vary by location.
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Price History
Current best price $4.11. Over the past 90 days: low $4.11, high $8.93, average $6.70 — down 39% vs average.
- AliExpress - HUDAMZKY-YUN Ebike Accessories Store Store
- AliExpress - Cycling Accessories Specialty Store
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Specifications
Specifications
- Sensor Type
- Cadence
- Pulse Count
- 8
Physical
- Weight
- 50 g
Ports & Connectors
| Pin | Wire color | Function |
|---|---|---|
| 1 | Red | 5V Power |
| 2 | Black | Ground |
| 3 | Yellow | PAS Signal |
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