500 Wireless Cyclometer



measuring and analysing your cycling.
An 8-function wireless cyclometer that is easy to install.

Ease of useIntuitive interface, simplified programming, large ergonomic buttons.
Parameter measurementCurrent/average/max speed, current/total distance, time, timer, speed comparison
Easy assembly / dismantlingExtremely quick and easy tool-free fitting on the stem or handlebar. Wireless.
Easy readingLarge display and numbers for quick and easy reading.
DurabilityWatertight assembly, durable case.
Warranty2 Years
Technical Information

Speed functions
Current, average and maximum speed. Speed comparison (compares the current speed with the average speed for the ride).
Distance functions
Partial (ride) and total distance.
Time functions
Digital clock, stopwatch.
General functions
Low-battery indicator on the speed sensor.


Sort by:
You'll struggle to get better for less
Used for More than 1 year
Installation is simple enough, the sensor needs to be rather close to the magnet to pick it up and a lot of people don't get this quite right, which will lead to pickup issues down the line. The sensor has to be cable-tied on, unlike in earlier versions which featured a rubber strap. Make sure to put some protective tape on your fork before you attach the sensor to minimise the risk of damage if you need to take it off. I found that the rubber strap for the display unit was shorter than necessary, so I had to mount it in a slightly different way, but it works and has never fallen off.

The unit itself is light, simple to use and the display is big and clear, which is important when you're on the move. Setting it up for your tyre size is so easy, too.

Other users have commented on a lack of cadence and heart rate compatibility, but for this price, I don't think we can complain too much.

In operation, I have found the unit to be very robust in all weather with excellent functionality, with exception to one issue; interference. I have an LED light on the handlebars, which causes the computer to under-read by a half or two-thirds. I also suspect the WiFi and Bluetooth from my phone may interfere, but I've yet to be sure. If you pick up one of these, I suggest you try it with your other electronic accessories and check for compatability.

Overall, it's light, extremely user friendly (once set up) and accurate and I'd happily reccommend one.
Excellent product
Used for 7 to 12 months
This is an excellent product and highly accurate, only issue that i faced was the rubber strap that comes with fork unit broke off but luckily i spotted it before it fell off. Had to use zip ties to refix it. Otherwise a very wise investment.
I bought this product many months ago and its supe
The rubber attachment for the fork unit brokeoff,
I have had this cycle computer for some time now. It has done app 3000 miles and has given me no problems during that period. I am not even sure that I have replaced the battery yet. The only dissapointment is that it does not include an RPM count which is pretty standard. Also, the instructions are very small and diffiuclt to follow. Mostly graphical multi language instructions.
Price and size of display
Lack of RPM count and decent installation instruct
Reliable, rugged, good value bike computer
Used for More than 1 year
I have had the B'Twin Count 8 bicycle computer for over a year and almost 4000km. I have not had to replace the batteries once, something I think is usually quite rare, especially on wireless bicycle computers. The device is extremely easy to set up and use, with 3 buttons, one dedicated for adjusting settings.

The mounting clip allows the computer to be mounted on the stem or handlebars, to allows the rider to free up space where it is needed.

Overall highly recommended for its reliability, ease of use and long battery life.
battery life, easy installation, easy to use
susceptible to interference from road sensors
changing my earlier review
Used for 1 week or less
I wrote a review on 20/10/2016 saying that the unit did not function. On taking it back the sales member showed me that it was working and that i obviously had not set it right. So I am happy to have my first review removed. However on the negative side the setting between magnet and reader is a very fine margin indeed which i was not able to initially achieve after much trial. also the two buttons are very stiff to push. My previous (wired) computer was much easier to operate and probably spoilt me!
How to get new holder
Used for 2 to 8 weeks
I have got this but someone removed the holder from the Bike. So I cant install the cyclometer on the bar. How to get a replacement of the holder, so this can be installed on the bar.
The cyclometer is make in such a way, that apart from installing it on the holder, there is no way, we can put it on the bar

Hope you get a smile on my face
Accurate and light
Used for 1 week or less
Good product and seems accurate over the time I have been using it. It would be 5* if it was possible to share data and compare history.
Accurate and light
Does not share/compare data
Doesn't work as expected!!
Used for 3 to 6 months
Bought it in month of May and used it for couple of month, but now its not working. Sometime stops counting the distance. Distance reading is not at all accurate.
I got big surprise when one morning it shows me total km = 80990km. Tried reseting the same, no luck !!
Response of the brand
Hello Shubhankar, 

Thank you for taking the time to give us your review. The product that you have purchased appears defective. Please explain the same to the store that you purchased it from and they will help you out with the replacement. 

Deepak Babu E-sport manager DECATHLON
Birthday Gift
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Great value. Quick to fit = one happy 10 year old.
Ease of fitting.
Btwin 500 Count 8
Used for More than 2 years
After an accident I emailed Decathlon France to see if I could get some spare straps and speed sensor. The main computer bit was fine. As no response, I have had to buy a 2nd one after having good service and information from the 1st one.
Now I have a spare, unusable computer readout which I could put on my other Bike ----- only if I had some spares !
I live in Spain and our local Decathlon did not want to know !
Good bike computer and reliable but....
Decathlon did not reply to enquiry for new spares.