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-   -   Cateye computers (http://www.bikeforums.net/electronics-lighting-gadgets/530577-cateye-computers.html)

George 04-13-09 10:57 AM

Cateye computers
 
So far I've gone through 4 of these computers and I was wondering what other riders are using. I've had 3 wireless and my current one is wired. I sent two back to Cateye and they replaced them after they ran a test on them, but I'm still having the same problems with the ones they send back to me. Every time I get around 20 mph it shows 0. More so going down hill. If I sprint at 20 mph it goes off. If I stay pedaling at a steady pace and pick up my speed gradely it's OK. The only thing I lose is the speed reading, all the other functions work. I was thinking about trying the Specialized computers, but I don't know how they would be. I tried the Sigma and I didn't have much luck with the either. Anybody have any ideas, thanks.

Armand 04-13-09 11:28 AM

Well if you've replaced the computer and it still gives the same problem then I would use common logic and say the sensor that picks up the magnet on the spoke is the culprit. Get cateye to replace that piece and then see if your problem keeps happening.

CCrew 04-13-09 11:40 AM

What's the distance from the magnet to the sensor? It's possible that it's losing accurate pulses.

George 04-13-09 11:48 AM

When Cateye sent the new ones they sent sensors and everything. So everything has been replaced and the sensor is mounted 17" from magnet to computer. Thanks for the replies.

bicycleflyer 04-13-09 12:03 PM

Something does not sound right here. You have gone through a lot of computers and two of the top brands in my book (sigma and cateye). I do not mean to sound like I am accusing you of something, but given that you have had so much trouble I would be inclined to look at the installation if I was your mechanic. Some more information is needed to help you figure this out.

Questions that come to mind for me...

1. When Cateye replaced the computers, did they replace just the computers? Were new wiring harnesses used?
2. What kind of clearence do you have between the fork sensor and the spoke magnet?
3. Was the computer secure in the mount... was there a definate click when you snapped it into place?
4. Were fresh batteries tried?
5. Is the magnet secure enough? Centrifugal force at high speed could cause it to slip.
6. What routing does your wire take?

I'm sure others will ask more questions too..

As far as other computer brands go, you have tried the top two. So I would say just about anything may work at this point. Feel free to experiment. It just may be an ol' cheapo may work best for you.

George 04-13-09 02:18 PM

Thanks for the replies everyone. I just cleaned the contacts and the magnet and I'll try it again tomorrow.

jack002 04-13-09 02:45 PM

What model was the cateye? I have the astrale and its been perfect. Had it since '00.

George 04-13-09 02:54 PM

Quote:

Originally Posted by jack002 (Post 8723342)
What model was the cateye? I have the astrale and its been perfect. Had it since '00.

Stada

SlimAgainSoon 04-14-09 10:10 AM

I've got a wireless Strada. Been flawless. Great computer, in my opinion.

keving12 04-14-09 06:47 PM

I have the Cateye Strada Cadence. Great computer, but a real challenge mounting it correctly.

GaryBy 04-15-09 05:09 PM

I have the CatEye CC-CD300DW, and never had that sort of problem.

The question about distance wasn't how far is the sensor from the computer, though 17 inches should be fine. The question is how far apart is the sensor from the magnet? On mine and on the Strada, they need to be at most 5mm apart, which less than a quarter inch. More importantly, the center of the magnet needs to be directly opposite the sensor zone, indicated by a marking on the sensor (and judging from the online manual, is not the center of the sensor).

I'm guessing from the 17" distance that you have the Strada without the cadence sensor. If that's the case, you might actually try moving both the sensor and magnet closer to the hub, while still maintaining that 5mm gap. My physics isn't great, but I think that by making the radius of rotation smaller, the magnet will spend more time within range of the sensor.

I apologize if this is overly pedantic, but the symptoms you describe point strongly at the magnet/sensor mounting as the source of the problem.

jack002 04-16-09 08:16 AM

The question is how far apart is the sensor from the magnet? On mine and on the Strada, they need to be at most 5mm apart

Yeah, thats critical. It was with mine. But all of mine. Once you get the sensor and magnet mounted and working together, they're fine, but not until then. I make them almost touch. 5mm would be too far on mine.

scubajim49 04-18-09 10:09 AM

Astrale 8 Cateye usage
 
Dear George: I have used a Astrale 8 Cateye for about 2-3 years now without a prolem.Haven't had to replace the batterie yet if I remember right. I ride approx. 2000 miles a year and I have had to replace the wiring harness due to bike shop placement of one of the sensor wires. I ride a Giant FCR4 with 700 X 30 tires and the wire was ran on the inside of the chain stay. I broke a spoke and my 275 pounds made the wheel out of true and rubbed the wire between the tire and chain stay. So I ran it on the top or outside if the chain stay. Has worked great ever since. Hope this helps a lil bit!

Scubajim49

daven1986 04-18-09 02:27 PM

I had this problem with a different computer - a cheap brand. I found that moving the magnet closer to the hub meant it spun slower at faster speeds and thus didn't read 0 at around 8mph. Although when I went faster (say 13mph) it still showed 0 but the speed was higher than before.

I got a wired VDO computer and haven't had the problem since.

GaryBy 04-19-09 07:41 AM

Quote:

Originally Posted by daven1986 (Post 8755440)
I had this problem with a different computer - a cheap brand. I found that moving the magnet closer to the hub meant it spun slower at faster speeds and thus didn't read 0 at around 8mph. Although when I went faster (say 13mph) it still showed 0 but the speed was higher than before.

I got a wired VDO computer and haven't had the problem since.

I can't parse this. Not reading 0 when going 8mph sounds like a good thing.

In any event, I've always assumed that the sensor isn't trying to measure the speed of the magnet as it goes by. It just counts every pass of the magnet, which equates to moving one wheel circumference worth. Then the computer uses its own clock to convert the distance into a speed. With a wireless, moving it closer to the hub may move it out of transmission range to the computer, which could cause a zero reading.

I start by positioning the sensor just far enough down the fork in order to meet the specified gap between magnet and sensor. Depending on how it mounts, you may be able to rotate the sensor closer to the spokes, which gives you some leeway. Usually I find 1/3 to 1/2 of the way from the rim will work. It's only the particular symptoms in the base note of this thread that prompted the suggestion to move closer to the hub. (For what it's worth, I'm only on my third computer, two Sigmas and CatEye, and I've never had any problems with the speed sensors.)

Wanderer 04-19-09 08:26 AM

I use a Cateye Strada, Cadence, wired. The only issue I have ever had, is losing cadence, which is easily corrected by cleaning the contacts of the head. Batteries even last a long time!

daven1986 04-19-09 09:05 AM

Sorry I wrote it in a hurry. My point was that the magnet was flying past the magnetic switch too quickly for it to register, moving it closer to the hub means its linear velocity is slower.

Barrettscv 04-19-09 11:41 AM

Quote:

Originally Posted by Wanderer (Post 8758509)
I use a Cateye Strada, Cadence, wired. The only issue I have ever had, is losing cadence, which is easily corrected by cleaning the contacts of the head. Batteries even last a long time!

I'm having this issue with a cateye Strada Cadence (wired) that was installed last month.

Do you use any solvent or cleaning materials when cleaning the contacts?

Michael

Wanderer 04-19-09 12:40 PM

Nope, I just polish them up with a pencil eraser......then dab a tiny bit of dielectric grease on them, wiping off, like a chain, when finished.

froze 04-25-09 07:58 PM

I had a wireless Cateye 2 that went dead. It lasted about 7 years which was a bit depressing since the wired one before that lasted 18 years and it was a cheap basic model. But maybe due to the sign of the times no company wants their computers wired or not to last that long. I'll see because I bought a wired Cateye Strada to replace the wireless. I liked the clean wireless look but durablity had me wondering...maybe for no reason? But I still like Cateye the best as a company because their customer service is beyond top notch.

srglassw 04-25-09 10:18 PM

The installation instructions for my wired Cateye Strada computer specifies that the clearance between the sensor surface and the magnet must not exceed 3mm. I had to build up the sensor mounting location with rubber shims to achieve the specified clearance when I installed mine and it has worked flawlessly. A clearance of 5mm is outside of the specs and may be too wide a gap.

keving12 04-27-09 06:56 PM

Quote:

Originally Posted by srglassw (Post 8801189)
The installation instructions for my wired Cateye Strada computer specifies that the clearance between the sensor surface and the magnet must not exceed 3mm. I had to build up the sensor mounting location with rubber shims to achieve the specified clearance when I installed mine and it has worked flawlessly. A clearance of 5mm is outside of the specs and may be too wide a gap.

I had to build up the sensor on the crank arm with rubber also (Simano Tiagra Crank)


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