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Speed Sensor Bike Computer


Speed Sensor Bike Computer

(12 customer reviews)

Size guide

Keep your performance in check with THREO Speed Sensor Bike Computer!

The THREO Speed Sensor Bike Computers feature a display mounted on the handlebars and a sensor mounted on the front fork to calculate speed and distance. You can judge either your speed in racing or mileage if attempting to cover a specific distance. By re-installing the battery, it is possible to switch the device between the speed and cadence sensor modes and keep your performance in check.

Supporting connection via ANT and Bluetooth, S3 can record data accurately, making it the best companion for a wide range of GPS computers and smartphone apps. Its smaller body (8.4mm thick and only 8.8g.) has longer battery life. With a CR2032 battery inside, the battery life can reach up to 500 hours. What’s more, with a new geomagnetic sensor chip inside, S3 does not need external magnets but still provides accurate data. You can optimize the battery cover and battery contacts for more convenient use. IP66 waterproofing can meet your daily needs, and there is no need to fear the weather.

To use the sensor as a cadence or speed sensor, reinsert the battery to change the mode quickly. The green light means speed mode, and the red indicates cadence tracking. Want to track both at once? Grab a 2 pack and record both cadence and speed. You can support dual devices using different protocols. ANT and Bluetooth dual-protocol support makes it compatible with 90% of the training equipment on the market. It supports the simultaneous connection of different protocols between two devices, allowing you to make multiple records of a single workout.  

✔️ CAN BE USED AS A CADENCE  — The THREO Sensor can be used as a cadence or speed sensor. Just reinsert the battery to quickly change modes. The green light means speed mode, and the red indicates cadence tracking. 

✔️ SHOWS ACCURATE RESULT  — Our speed sensor helps check your permanence and gives accurate results.

✔️ COMPATIBLE WITH MOST DEVICES — Compatible with ANT & Bluetooth 4.0 devices. Bluetooth connection works with smartphones & bike computers. It works with Zwift, Garmin, Bryton, iGPSPORT, Onelap, BKool, TACX, and more.

✔️ EASY TO INSTALL — Lightweight design easily installs your bike’s crank arm or wheel hub with the included rubber-elastic rings. Connect the sensor to the crank arm for cadence tracking or the wheel hub for speed measurements. 


Note: Remove the insulating sheet of the pre-installed battery before usage; re-install the battery to switch between the speed and cadence mode.

Additional information

Weight0.0 kg
Rated 4.56 out of 5 stars
of respondents would recommend this to a friend

Ratings Distribution

Reviewed by 12 customers
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  1. A**a (verified owner)

    New Zealand

    I prefer this sensor to others because it is very easy to use and works clearly

  2. Y***j (verified owner)

    New Zealand

    I use this for cadence, it rightly determines the economy of movement, power output. Works well!

  3. K***y (verified owner)

    New Zealand

    I like the waterproof feature of this speed sensor. I rode in the rain and forgot that he was on my bike, on the second day it worked fine. Super quality!

  4. L***n (verified owner)

    New Zealand

    I love the compact size. It is very comfortable to use and easy to install. The quality is great with Ant+. It deserves 5*

  5. S**a (verified owner)

    New Zealand

    I’ve always used Garmin, but I needed two sensors, one for my mountain bike and the other for the stationary bike. So I decided to try this one. It’s very easy to set up! After a few months, it still works fine.

  6. D**e (verified owner)

    New Zealand

    I connect it to my phone via Bluetooth. Once you get it to work, it does a great job!

  7. T**a (verified owner)

    New Zealand

    I am completely happy with this bike speed sensor. I only use it as a cadence sensor and it suits my needs perfectly

  8. P**d (verified owner)

    New Zealand

    I bought this for my bike to use for training. I like this little but useful gadget.. It works accurately

  9. I**a (verified owner)

    New Zealand

    It is accurate on cadence reading. I have been using it for almost a week and can say that it works well

  10. H***n (verified owner)

    New Zealand

    I connect the bluetooth through the Wahoo app which was pretty easy. The installation takes 1-2 minutes

  11. D**s (verified owner)

    New Zealand

    After using it several times, it seems like it is stuck (

  12. P**d (verified owner)

    New Zealand

    It’s small and slim, convenient to use. Not bad!

Size guide

Up to 20% OFF Your First Purchase

Up to 20% OFF Your First Purchase

Speed Sensor Bike Computer

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