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Old 07-31-02, 08:39 PM   #1
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odometer/computer mounting questions

i just got a odometer thing and it says the sensor is supposed to be 2 millimeters from the magnet that is mounted on the spokes.

but when i mount the magnet how it should be the sensor hits it when the wheel spins.

the only way to prevent it is to stuff something under one end of the sensor that rests on the forks. so it's tilted.

no big deal but how would y'all mount it?

if you need more info just ask.

thanks
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Old 08-01-02, 12:56 AM   #2
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My comp's sensor is shaped for round forks. My forks are oval. As a result, I had to tilt the sensor a bit to get it properly positioned. No problems so far (2200kms), just make sure it stays tilted and does not move when you ride.

You shouldn't necessarily have to tilt the sensor just to get the proper distance from magnet. Moving the sensor (and the magnet) up / down should do the trick. Is there something in your forks that prevents you from moving the sensor up?

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Old 08-01-02, 01:03 AM   #3
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Try moving the sensor, if you have it on the front side of the forks then try it on the rear or on the other fork leg. Most sensors have an adjustment allowing them to be angled front to back. Also, make sure that the mark on the sensor is what you are aligning up with the magnet. Some sensors extend below the actual area that picks the signal up. What type of computer is it?
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Old 08-01-02, 01:06 AM   #4
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I can move the sensor all over, that's not the problem.

I can't move the magnet on the spokes. it only wants to securely sit in one spot on my spokes.

so that meens the sensor has to be fixed to my forks in one specific area only.

I managed to shove some cut up pop can aluminum under one end to give it the correct angle but i'm not sure how long it will last.


it should be fine if I don't run into any trees I think....
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Old 08-01-02, 01:20 AM   #5
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it's a low end cat eye.
cat eye velo 2 is what it says on it.

I'll try twisting the sensor around on the fork blade. I kinda thought it needed to be on the very inside of the fork blade.

the problem is, the sensor needs to be 2mm from the magnet in the forks.
that's a pretty close tolerence.
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Old 08-01-02, 01:47 AM   #6
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Quote:
Originally posted by pnj
I'll try twisting the sensor around on the fork blade. I kinda thought it needed to be on the very inside of the fork blade.
I had to put the sensor on almost one edge of the fork blade to get it sit properly. As mentioned, no problems so far.

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Old 08-01-02, 08:32 AM   #7
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Quote:
Originally posted by pnj
I can't move the magnet on the spokes. it only wants to securely sit in one spot on my spokes.
Why can you not simply slip the magnet up or down on the spokes? I guess I'm not quite understanding the problem. Why will the magnet only securely sit in one spot on your spokes?
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Old 08-01-02, 08:40 AM   #8
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Might it be that the sensor fits to 2 spokes and so has to be at a certain point to attach to both.?
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Old 08-01-02, 09:15 AM   #9
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Chewa got it,

I tried to put the sensor on just one spoke but it wasn't as secure.
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Old 08-01-02, 10:37 AM   #10
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Quote:
Originally posted by pnj
I can move the sensor all over, that's not the problem.
I managed to shove some cut up pop can aluminum under one end to give it the correct angle but i'm not sure how long it will last.
I don't understand why you need to put the aluminum "shim" under the sensor. I've never had problems mounting a cateye sensor or magnet.
There is no special "angle". The sensor just mounts flat on the fork. Just move it around the fork (toward the spokes) until the computer display shows that it is working.
If you are having to move it too close to the spokes, try moving it up or down the fork until the sensor and magnet are aligned.
BTW: The line on the sensor and the mark on the magnet are not necessarily the precise points to line up. As I said above, slide the sensor up or down until you see a reading on the display.

Forgot to mention that the 2mm is not an exact distance either. There is nothing about the unit that is THAT critical. When the display shows a reading and the sensor doesn't hit the spokes, you have everything set correctly.
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Last edited by RonH; 08-01-02 at 10:41 AM.
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Old 08-01-02, 10:46 AM   #11
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RonH,

the main problem is my head being in my arse.

for some dumb reason I thought the sensor had to be on the very inside of the forks....

I didn't have time to re-adjust it last night and now I'm at work(oh joy).

I will pull the shims out and slide the sensor around the forks for a better fit.

Thanks again y'all!
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Old 08-01-02, 01:14 PM   #12
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Quote:
Originally posted by pnj
RonH,

the main problem is my head being in my arse.
No shame it that. We've all been there, and I'll be there again ... perhaps before the day is done!

Good luck with the computer!
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Old 08-01-02, 01:36 PM   #13
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Old 08-01-02, 02:20 PM   #14
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Glad you solved it.

For others with difficulty, especially with less expensive sensors, wrapping a small piece of duct tape around the fork before you attach the sensor usually prevents slipping.

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Old 08-01-02, 02:31 PM   #15
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Quote:
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RonH,

the main problem is my head being in my arse.

You would think that they would have one of those little smiley faces shaped like that! We could all use that a lot.

Hey Joe? what do you think? A smileyface looking out of two full moons....can you do that?....tastefully?
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Old 08-03-02, 08:09 AM   #16
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Quote:
Originally posted by bac
Why can you not simply slip the magnet up or down on the spokes? I guess I'm not quite understanding the problem. Why will the magnet only securely sit in one spot on your spokes?
I had the same problem with my new Fuji. I have the wheels of the Fuji Team on my Fuji Roubaix. The Fuji Team wheels have Ritchey/DT Aero Bladed (flat) spokes.

The only round part of the spokes are by the nipples and the hub. Other than that, the spokes are flat and therefore I was not able to slide the magnet up or down the spokes.
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Old 08-26-10, 04:47 PM   #17
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Cat Eye Sensor Mounting On Spoke

I'm installing my Cat Eye bike computer. I'm trying to determine how far from the rim the sensor should be on the spoke. Just want as accurate a reading as possible. The install instructions don't provide the guidelines from what I can see.

Any help is appreciated. Thanks in advance.
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Old 08-26-10, 05:32 PM   #18
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I'm installing my Cat Eye bike computer. I'm trying to determine how far from the rim the sensor should be on the spoke. Just want as accurate a reading as possible. The install instructions don't provide the guidelines from what I can see.

Any help is appreciated. Thanks in advance.
The accuracy has nothing to do with the magnet/sensor. It just counts turns. The accuracy comes from the wheel size input. For the most accurate use a wheel roll out rather than the numbers in a chart.
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Old 08-26-10, 05:32 PM   #19
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Raleigh_Rider, I can't see a bit of difference in performance. Just kind of coordinate the position with the position of the the magnet with the position of the transmitter to get inside the maximum distance allowed. Usually, different positions of the magnet will yield different gaps. Less gap is better so long as the two don't collide. I've used several Cat Eyes, and they are a bit more forgiving on gap than the x-mart brands.
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Old 08-26-10, 05:58 PM   #20
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The accuracy has nothing to do with the magnet/sensor. It just counts turns. The accuracy comes from the wheel size input. For the most accurate use a wheel roll out rather than the numbers in a chart.
Thanks!
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Old 08-26-10, 05:59 PM   #21
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Raleigh_Rider, I can't see a bit of difference in performance. Just kind of coordinate the position with the position of the the magnet with the position of the transmitter to get inside the maximum distance allowed. Usually, different positions of the magnet will yield different gaps. Less gap is better so long as the two don't collide. I've used several Cat Eyes, and they are a bit more forgiving on gap than the x-mart brands.
Thanks for the help!
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Old 08-26-10, 06:54 PM   #22
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I bought a cheap wireless cyclocomp off ebay - some Chinese thing for $1.

It works great. The transmitter mounts right on the front of my carbon aero fork, as it has a cutout for this purpose. It will also mount to a regular tubular fork. It can be angled a little if needed, too.
The magnet will adjust to any pace on the spoke I wish So I can use the lacing taper to get the magnet close to the x-mitter if needed. Between the two, It has fit up nicely.

Have you tried it on the rear stay?
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Old 08-26-10, 09:59 PM   #23
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I bought a cheap wireless cyclocomp off ebay - some Chinese thing for $1.

It works great. The transmitter mounts right on the front of my carbon aero fork, as it has a cutout for this purpose. It will also mount to a regular tubular fork. It can be angled a little if needed, too.
The magnet will adjust to any pace on the spoke I wish So I can use the lacing taper to get the magnet close to the x-mitter if needed. Between the two, It has fit up nicely.

Have you tried it on the rear stay?
Nah, went with wired unit. Read too much about poss interference and whacked out readings so went with what was familiar. I had an early version of Cat Eye which I still use on my Technium.
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