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 $5 across 2 sellers.
Specs verified Jun 26, 2026
Where to Find
Prices tracked across 2 sellersAliExpress - Cycling Accessories Specialty Store
$4.66 + $1.99 shipping
AliExpress - HUDAMZKY-YUN Ebike Accessories Store Store
$8.63 + $1.99 shipping
* Shipping estimates are for the contiguous US and may vary by location.
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Price History
Current best price $4.66. Over the past 90 days: low $4.46, high $8.63, average $6.38 — down 27% vs average.
- AliExpress - HUDAMZKY-YUN Ebike Accessories Store Store
- AliExpress - Cycling Accessories Specialty Store
| Date | Price | Shipping | Total | Change | Coupon | Rating | Sales | In Stock | Status |
|---|---|---|---|---|---|---|---|---|---|
AliExpress - Cycling Accessories Specialty Store(6 records) | |||||||||
| Jun 26, 202607:48 AM | $4.66 | $1.99 | $6.65 | $0.12 | — | — | — | Yes | active |
| May 29, 202604:41 PM | $4.78 | $1.99 | $6.77 | $0.00 | — | — | — | Yes | active |
| May 29, 202604:41 PM | $4.78 | $1.99 | $6.77 | $0.00 | — | — | — | Yes | active |
| May 29, 202604:40 PM | $4.78 | $1.99 | $6.77 | $0.02 | — | — | — | Yes | active |
| May 26, 202609:39 PM | $4.76 | $1.99 | $6.75 | $0.30 | — | — | — | Yes | active |
| May 4, 202609:21 AM | $4.46 | $1.99 | $6.45 | Initial | — | — | — | Yes | active |
AliExpress - HUDAMZKY-YUN Ebike Accessories Store Store(5 records) | |||||||||
| Jun 11, 202607:50 AM | $8.63 | $1.99 | $10.62 | $0.50 | — | — | — | Yes | active |
| May 29, 202604:03 PM | $8.13 | $1.99 | $10.12 | $0.00 | — | — | — | Yes | active |
| May 29, 202604:02 PM | $8.13 | $1.99 | $10.12 | $0.00 | — | — | — | Yes | active |
| May 26, 202609:39 PM | $8.13 | $1.99 | $10.12 | $0.39 | — | — | — | Yes | active |
| May 4, 202609:21 AM | $7.74 | $1.99 | $9.73 | 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 |
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