KT BZ-4(8) (Waterproof)
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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 $9.
Specs verified May 29, 2026
Where to Find
Prices tracked across 1 seller* Shipping estimates are for the contiguous US and may vary by location.
Price History
Current best price $8.90. Over the past 90 days: low $8.90, high $8.90, average $8.90 — about average.
- AliExpress - HUDAMZKY-YUN Ebike Accessories Store Store
| Date | Price | Shipping | Total | Change | Coupon | Rating | Sales | In Stock | Status |
|---|---|---|---|---|---|---|---|---|---|
AliExpress - HUDAMZKY-YUN Ebike Accessories Store Store(4 records) | |||||||||
| May 29, 202604:03 PM | $8.90 | $1.99 | $10.89 | $0.00 | — | — | — | Yes | active |
| May 29, 202604:03 PM | $8.90 | $1.99 | $10.89 | $0.00 | — | — | — | Yes | active |
| May 29, 202604:02 PM | $8.90 | $1.99 | $10.89 | $0.00 | — | — | — | Yes | active |
| May 26, 202609:40 PM | $8.90 | $1.99 | $10.89 | Initial | — | — | — | Yes | active |
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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 |
