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Question about Cateye V3 Speed Sensor mounting

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Question about Cateye V3 Speed Sensor mounting

Old 04-22-09, 05:44 PM
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Question about Cateye V3 Speed Sensor mounting

I installed my computer according to the instructions, or at least I think I did. But, the speed seems to be low. I rode past a stationary traffic speed detector/display with no cars around and it read 29 when I was reading 22 on my computer. Is there a specific spot on the spoke where the speed magnet needs to be? I have it a 3 or 4 inches in so the cadence sensor can read the cadence magnet, which I have mounted directly to my pedal spindle. Is this wrong? Do I need to have the magnet all the way to the nipple of the spoke?
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Old 04-22-09, 05:53 PM
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It doesn't matter where the magnet is on the spoke, you have to set the wheel ratio on the computer itself correctly. Check the size of your tire and look in the manual for the correct ratio.
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Old 04-22-09, 05:57 PM
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Originally Posted by scoots826
It doesn't matter where the magnet is on the spoke, you have to set the wheel ratio on the computer itself correctly. Check the size of your tire and look in the manual for the correct ratio.
I set it to the measurement corresponding with a 700X23 tire in the manual. Maybe it didn't take. I'll give it a double check as soon as I get home.
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Old 04-22-09, 06:04 PM
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29mph? how hard of an effort were you giving? downhill? tail wind?

29mph is about what I'd expect if you were sprinting, had a downhill or strong tailwind.
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Old 04-22-09, 06:09 PM
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Originally Posted by AEO
29mph? how hard of an effort were you giving? downhill? tail wind?

29mph is about what I'd expect if you were sprinting, had a downhill or strong tailwind.
I was pushing pretty hard on a slight downhill.
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Old 04-22-09, 06:14 PM
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ok, I'd double check the wheel size in the computer and also make sure the sensor isn't too far from the magnet.
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Old 04-22-09, 06:22 PM
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Originally Posted by MarkSLC
I installed my computer according to the instructions, or at least I think I did. But, the speed seems to be low. I rode past a stationary traffic speed detector/display with no cars around and it read 29 when I was reading 22 on my computer. Is there a specific spot on the spoke where the speed magnet needs to be? I have it a 3 or 4 inches in so the cadence sensor can read the cadence magnet, which I have mounted directly to my pedal spindle. Is this wrong? Do I need to have the magnet all the way to the nipple of the spoke?
i wonder how speed traps make money?
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Old 04-22-09, 07:07 PM
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I've found that booklet that comes with the computer and tells you the circumfrence of various size tires to be pretty innacurate. Near worthless for mtb tires especially.

Get a grease pen (chalk may work) and mark a line across the tire tread, sit on your bike and roll across the tile kitchen floor (mulitple revolutions for greater accuracy), and measure the actual rollout of the tire. Then if you and your buddy's computers don't agree at the end of a ride, you can tell him with confidence that his is wrong and yours is right.

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Old 04-22-09, 07:17 PM
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I used the set up guide in the manual for that computer and my 700x25C and the measured distance of my after work ride in google maps is 15.2 miles and the computer reads 15.5 miles. 0.3/15 - 2% error.
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Old 04-22-09, 10:01 PM
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Originally Posted by pdedes
i wonder how speed traps make money?
I couldn't remember what they were called so I just gave the basic description.. You knew what I meant, eh?
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Old 04-22-09, 10:27 PM
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Originally Posted by pdedes
i wonder how speed traps make money?
As far as I know they don't make any, they just make people slow down.
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