COOSPO BK9 Cadence & Speed Sensor (Bluetooth 5.0 + ANT+) with IP67 rating and long battery life

If you’re training with a bike computer or cycling apps, having your cadence tracked reliably makes your sessions feel a lot less guessy. The COOSPO BK9 is a dual-band cycling sensor built to send cadence and speed data via both Bluetooth 5.0 and ANT+, so you’re not stuck with a single setup.

It’s not trying to be a “smart bike” retrofit for every possible ecosystem, though. On paper, it targets straightforward use: attach it to your crank, pair it to your preferred app or device, and let it feed real-time RPM-style data while you ride.