COOSPO BK467 on an Exercise Bike: Cadence Works, but Apple Watch Shows Slow Speeds

This is the English edition of a review from my Japanese YouTube channel, iestaLife. I test gadgets from my home in Japan, so product links go to Amazon Japan.

Quick take

I put a COOSPO BK467 speed/cadence sensor on my home exercise bike to track my rides. Mounting it on the crank was easy and cadence worked right away. Getting a speed reading took a workaround in the COOSPO Ride app, and pairing it with Apple Watch Workout gave speeds far slower than it felt, because the Watch caps the wheel circumference at 2,500 mm.

COOSPO BK467 speed and cadence sensor box — The COOSPO BK467 package

What I tested

COOSPO BK467 in cadence mode (on the pedal crank) and speed mode
A home exercise bike, which has no wheel to mount a speed sensor on
The COOSPO Ride app on iPhone
Apple Watch Workout, connected to the sensor

What I found

Mounting is simple. The sensor straps onto the crank with the included rubber pads and bands, and it stayed out of the way while pedaling. It glows blue in cadence mode; you switch modes by removing and reinserting the battery.

COOSPO BK467 mounted on an exercise bike crank — Mounted near the crank axle

Cadence works, speed does not—at first. In cadence mode you get pedal RPM but no speed or distance. To get speed, I switched to speed mode and mounted the sensor close to the rotating crank axle, so the app treats pedal turns as wheel turns.

COOSPO Ride can give a usable estimate. With a normal wheel size, speed read very low. Following a tip from another blogger, I set the circumference to about 5.2 m in COOSPO Ride, and the numbers felt roughly right. It is still an estimate, not a real road speed.

COOSPO Ride app showing speed from an exercise bike — Speed in COOSPO Ride after adjusting the circumference

Apple Watch tops out at 2,500 mm. Speed shows up in Workout, but in the setup I tried, the maximum circumference I could enter was 2.5 m—less than half of what I needed—so speed always reads much slower than it feels.

Recording with	Circumference setting	Speed reading
COOSPO Ride (iPhone)	About 5.2 m possible	Roughly matches how it feels
Apple Watch Workout	Up to 2,500 mm	Much slower than it feels

Who it’s for

Good for logging cadence on an exercise bike
Good for anyone happy to see a speed estimate in the COOSPO Ride app on iPhone
Not ideal if you want speed and distance inside Apple Watch Workout
Not ideal if you expect road-bike-accurate speed

Watch the video

The video is in Japanese. Useful moments: around 3:10 for mounting on the bike, and 3:40 onward for the app and Apple Watch results.

Limitations

I tested one sensor on one exercise bike. The 5.2 m circumference is a workaround that gives a rough figure, not a calibrated speed. Some exercise bike makers sell their own speed sensors, which might work better with Apple Watch; I did not test those.

Products

COOSPO BK467 speed/cadence sensor: on Amazon Japan

The Amazon Japan link above is an affiliate link. As an Amazon Associate, I earn from qualifying purchases. Check the listing for the exact model, current price and shipping availability in your region.

More reviews in English