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Promise to only buy Cheap speedometers.

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Promise to only buy Cheap speedometers.

Old 07-31-09, 02:54 AM
  #1  
cyclezealot
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Promise to only buy Cheap speedometers.

How many forum members have had my luck with speedometers.. I buy a basic speedometers at a bike shop for about 30 bucks or more .. I install it according to the pictures on the instruction sheet , since such simple tasks require few words...
Picture for picture my installation looks identical to what is on the instruction manual.. Two or three times, the LCD display lights up , so it apparently works ok. But, it goes blank after spinning the wheel or going out on a ride. Apparently the signal is not being registered from the sender unit.. (It keeps the clock functions working ok.) I reappy the sender unit and magnet. Still not working.
So , I buy a really cheap unit I bought from the K Mart for 15 dollars.. . It works. Whats up..
. Others have such luck..
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Old 07-31-09, 03:24 AM
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You're probably riding too fast.
The K-Mart ones are likely designed to go on motorcycles.

That, or you're not getting the sensor close enough.
How often are you buying bike computers anyways? Monthly? I got 15 years out of my last one. Vetta.
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Old 07-31-09, 03:48 AM
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Metzinger.. With four bikes. maybe one every year and a half or so.. My 30 dollar units have been the ones to not work.. My cheap , K Mart model worked just fine.. Guess, it 's just my bad luck..
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Old 07-31-09, 05:00 AM
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I picked up a scwinn speedo/trip at target. works great, dont need anything more advance than that
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Old 07-31-09, 08:22 AM
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check the distance between the magnet and the receiver. I've seen suggestions to replace the included magnet with a more powerful rare-earth magnet.
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Old 07-31-09, 08:23 AM
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your sensor is probably not close enough
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Old 07-31-09, 09:27 AM
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Rust, dirt, or other substance on the contacts between the mount and computer? The wires are pretty flimsy, check that the cable is intact and magnet bit is working by using an Ohm reader with the magnet next to the end of the wire.
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Old 07-31-09, 10:13 AM
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It might be the battery. There's no telling how long it sat on the shelf.

If this is a wireless unit, change the sensor battery and the main-unit battery.

Timekeeping has a very tiny draw from the battery, so it could probably keep going even if there's not enough juice left to operate the cyclometer.
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Old 07-31-09, 10:52 AM
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Originally Posted by clancy98 View Post
your sensor is probably not close enough
That's what I think too. Anything else on a new computer would be really unusual. Having the identical problem on multiple computers and we're talking lottery odds.
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Old 07-31-09, 11:28 AM
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Cateye Enduro runs 35.00 has heavy duty wire about the thicknes of cable housing and cateyes head units rarely have a problem.
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Old 07-31-09, 02:45 PM
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Sometimes, while riding, the sensor is so close I hear it occasionally rub. I think i'll replace the new magnet with one that looks more solid from an old unit and see what happens.
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Old 07-31-09, 03:53 PM
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I won't spend more than 30 bucks for a computer, I'm clumsy and tend to break stuff.

I have one blackburn that has a weird glitch with the wheel sensor. It will only pickup the magnet when the magnet passes to the extreme end of the sensor. I tried cleaning it, didn't help. At one point it wouldn't respond at all, so I went and bought a Sigma from an LL Bean outlet for 24 dollars.

On the ride home I finagled with the sensor and magnet some more and sure enough it came back to life. It's worked fine ever since. I think it's a worn wire. The sigma is still in the box, kept it as a spare.

The cadence magnets also all fell off within a month after I bought it. Very poorly glued on. That computer is on my bad weather commuter, so I'm not overly concerned about the cadence anyway.

The nice thing about LL Bean is that if you're not 100% satisfied, they'll take back used stuff, even other maufacturers products. If the Sigma computer sucks, it's going back.
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Old 07-31-09, 08:16 PM
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I bought the Bell wireless cyclocomputer at Wal-Mart for $20. It works fine, but the magnet and sensor do have to be very close.
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Old 08-01-09, 01:36 AM
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If the sensor battery is low, the clock in the main unit will still work and the speedo might work for a few minutes before it goes out.
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Old 08-01-09, 01:50 AM
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Mach.. Speedo did not light up so much for a second, from the get go.. My problem with buying bike stuff. I am never in the same place.. We travel too much.. Where I buy stuff is not where problems evolve.. So, as a result the store is too far away.. What's 30 bucks. ?. The latest speedometers was a Trek product.. I'll put a larger bigger magnet on the bike for tomorrow's ride and see what happens. This has happened two or three times. Buying different batteries each time a problem evolves gets old. Luckily the bike with the K Mart speedometer on it, is what I normally ride for club rides.
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Old 08-01-09, 09:27 AM
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With my cateye sensor put on with just the zip ties, I found that it moved around a little. Yesterday I put a spot of epoxy in there to keep things from shifting around.
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Old 08-01-09, 01:44 PM
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CZ, keep us posted on how this goes.
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Old 08-01-09, 03:05 PM
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Originally Posted by cyclezealot View Post
Sometimes, while riding, the sensor is so close I hear it occasionally rub.
Try a few different distances, up to 6mm or so. If the sensor and magnet are too close, I don't know, maybe the leaf switch bounces.
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Old 08-01-09, 05:00 PM
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Looked at some of my old magnets from past computers. Won't fit my bike in question because it has bladed spokes and that odd shape would not accommodate that style magnet.. Had some club members look at my set up. They shrugged their shoulders. ?. Looks ok, I guess. / Get tired buying new batteries for new computers- cause in the past it did not help. But, will.
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Old 08-01-09, 05:50 PM
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dead batts. when i buy from my lbs, it's always dead batts. what a buncha wankers.
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