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Noticed today that the speed on my Cat Eye Wireless Cycle Computer was fluctuating between 14mph and dropping to 8 or 9mph without the bike losing speed. Have you any suggestions for this malfunction?

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You should change the batteries on the transmitter on the fork of the bike, usually when that goes low, the readings can be erratic.

Posted on Mar 15, 2011

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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 http://knowledgebase.cateye.com/questions/67/How+do+I+get+my+computer+head+unit+to+register+a+signal+with+the+sensor%3F

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.

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http://www.sigmasport.com/en/service_center/produkt_support/bikecomputer/

Without input from the wheel sensor it will not calculate anything. If it's wireless maybe it lacks a good line of sight or it's too far away. Take it off the handlebar, prop the bike so you can spin the wheel and hold the computer close to the transponder to see if it indeed CAN see it. Then work out the distance or line of sight issue.

Don't fixate on your computer once you get it working. I destroyed a bike frame when I crashed while watching my first bike computer at the end of a ride.

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It's possible water contamination is the problem. Put the computer in a Ziploc bag of rice for a day and try again. If that does not work probably a replacement is the best option, assuming it is out of warranty.

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It sounds like you know what's wrong - distance. Take the magnet in your hand and wave it past the cadence sensor to see if THAT works.

As far as why your crankarm and chainstay are too far apart, well, maybe your bottom bracket is too long or something, but it is mostly beyond the scope of anyone who can't see it to judge. Take it to a bike shop and ask them.

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