Question about Polar CS100

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Hi, i have bought a bike with a polar cs100 computer attached,only for some reason can remove the display unit, please can you assist me on the save removal of the i do not have any instructions. thanks richard

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Is it mounted on the handlebar? Try pushing down gently and then twist 90 degrees. It should come away from the bar mount. It attaches the same way in reverse. 

Posted on Feb 02, 2009

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I just bought an led light set for my new diamondback bike. Which is fine except I don't know how to attach it to the bike the pieces that came with it only attach together. Am I missing something?

If you feel pieces are missing, return the unit and get a new one. Aside from that, you would have to improvise a fastener to attach to the frame or handlebars. 7_16_2013_10_17_55_pm.jpg

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Had this same problem and nothing worked after trying everything I could think of. Speedometer would never display a blinking 0 (just stagnant). Turned out the computer mount on the handle bar was turned around backwards. The sigma letters go towards the front of the bike. Placed the device in the mount, the 0 started blinking and sync'd up with sensor. Finally works!

Sep 13, 2012 | Sigma Sport BC 1009 STS Wireless Computer

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Hi My bike has recently been serviced and now the computer won't recognise any distance travelled. The sensor is all in line etc and the display is fine...any suggestions?

Below is the answer from Cat Eye's website. 9 times out of 10 the magnet has moved either up the spoke or the front wheel was put on with the magnet on the opposite side from the sensor. After that the sensor could of moved outboard a cm or 2 from the magnet. Then start with the battery tests as outlined below. Remember with a wireless model you have two batteries, one in the computer and one in the transmitter.

From Cat Eye's website

How do I get my computer head unit to register a signal with the sensor?
If you computer head unit does not pick up a signal or does not seem to "communicate" with the sensor - check the following:

First, make sure the "AT" icon or "AUTO" is displayed on the screen (computer is in auto-timer mode, not manual stop/start mode).

Second, make sure the magnet is passing within 2-3 mm of the mark on the sensor (on the fork blade or chainstay, depending on model).

If neither help restore a consistent signal, then it could be either a low battery or a damaged wiring (Bracket/Sensor) kit.

Even if the LCD display is clear and bright, the battery may be too low to transmit a signal from the sensor to the computer head unit.

Next, with a fresh battery installed, try performing a manual restart operation to bring the LCD display back to life. Do this by either 1. pressing both buttons (Mode and Set on back) OR 2. all three buttons (Mode, Start/Stop, and small Set button on back) at once and then releasing all three OR 3. by pressing the AC (all-clear) button if your computer has one. This should bring the display back to life, and the unit can now be re-calibrated for your bike. See if consistent signal is re-established.

Finally, If that does not help, take a paper clip and bridge the 2 diagonally opposed metal contacts on the back of the computer head unit. If random information appears in the current speed display (upper portion of screen) while bridging the contacts, then the computer head unit is fine and the problem lies with the bracket/sensor kit. It may be stretched or damaged just enough to interrupt the signal transmission, even if not visibly so. If that is the case, please visit our small parts site to purchase the appropriate replacement sensor kit.

Jun 25, 2011 | Cat Eye Micro Wireless/CC-MC100W

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I have the CS200 and can't figure out how to turn it OFF after riding my bike. Can you help me with that? Where would I get a copy of the instruction manual. Thank you, Nancy

The CS200 should automatically turn itself off. A copy of the manual can be found here:

Feb 18, 2011 | Polar CS200 Cycle Computer/Heart Rate...

1 Answer

I have just change my bike. The Polar CS200cad worked perfectly on the old bike. Moved unit to new bike and now whenever my speed reaches 24kph the speed is "paused" and won't work again until...

As much as I hate to go straight to the 'reboot it' bin, if it's acting wierd maybe it needs a reboot.

I had a Cateye cyclometer freeze at a speed and distance once and it wouldn't respond to anything until I pulled the battery.

Jan 23, 2011 | Polar CS200cad Cycling Computers

1 Answer

Just bought a new polar CS100B cycle computer. Installed in on my bike but the speed is not registering at all.

Check the distance and aligment between the magnet on the wheel and the sensor on the fork, if too far it will not works properly.

May 18, 2010 | Polar CS100B Cycling Computer Heart Rate...

1 Answer

Intermittent failure of hr detection

Several issues with the Polar unit, 1 if it is in the cold the unit does not work properly. 2. If your layering yourself the unit will not work properly. 3, If the unit is not place properly on the body and there is not sufficient moisture, the unit will not work properly.

The best that I can suggest is make sure that you have sufficient moisture on your body, hold the polar cs100 near your body till it detects a heartbeat, the place back on the bike.

If your layering do to weather, you may not get it to respond till spring. I know what a waste.

By the way I had the CS 200, and I can't begin to tell you how many of my riding buddies had the same issue that your talking about including me.

The situation with polar rarely has to do with with interference but with a weak transmitter.

Oct 12, 2009 | Polar CS100

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Battery replacement polar cadence sensor CS 200

Polar sucks, I'm going to Cateye

Sep 06, 2009 | Polar CS200

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Infra red connection does not work ! Speed sensor does not work !

I had an infrared connection problem with my Polar Heart rate/ Cycle Speedo and in the end it was the Infrared USB receiver i had plugged into my pc which was busted.As soon as i tried a friends Infrared receiver it worked.If that is not the case with yours then maybe the infrared receiver's drivers are not installed on your pc,stopping it working.

With your speed sensor not working,it could either be the batteries in the wheel sensor or the actual polar watch are low or flat or the wheel sensor is not close enough to the small magnet that should be attached to one of the spokes on the wheel.They should be set so that they are almost touching,about 2-4mms apart.

Hope that helps,let me know more detailed info if you still have trouble

May 19, 2009 | Polar CS 400 Wireless Bike Computer

1 Answer

Teaching sensor for polar 800sd

Hi Wandawang,

I'm going to respond assuming the sensor you are referring to is the S3 stride sensor. If I am wrong, please let me know.

The S3 stride sensor uses a 2.4gHz frequency so when teaching the new sensor to the RS800 be sure to stay away from electrical equipment like cordless phones, wireless internet..etc.. This could be your issue.

Another issue could be that when replacing the battery, you bent the battery contacts in the sensor. So now the battery is not making a good contact with the sensor. You can fix this by taking the battery out of the sensor, and looking at the battery contact on the outer edge of the compartment. Take a pen, or small pair of pliers and bend those contacts back towards the battery. Place the battery back in, making sure the "open" is lined up to the "open" line on the battery cap. Insert the cap from the back end first and put pressure where the open symbol is to close the cap.

If this does not solve your issue, please contact us directly at

Best regards,

-Chris @ Polar USA

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