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Astrale 8 magnet/sensor noise??(5 posts)

Astrale 8 magnet/sensor noise??Caseysdad
Sep 22, 2003 4:24 AM
Okay, this is admittedly a long shot, but when all else fails...

I was doing some general maintenance on my bike and noticed a very faint "tick" when I spun the front wheel. (Open Pro w/ Record hub.) I eliminated most of the usual sources and even went so far as to pull apart the hub, clean and re-grease everything. No change.

As I was about to give up, I noticed that the tick occurred each time the magnet for my Astrale 8 passed the sensor. I double and triple-checked to make sure that there was no contact between them and that both were mounted securely, but the sound persisted. Exactly the same faint tick, whether I spun the wheel clockwise or counter-clockwise, at precisely the point at which the magnet passes the sensor.

Now, I can't imagine that there are any moving parts involved here, but as far as I can tell, I've eliminated all other possibilities, so the only explanation left seems to be that the sound is somehow being produced by the magnet or sensor. Any insights or opinions? Similar experiences? Solutions? Thanks!
re: Astrale 8 magnet/sensor noise??divve
Sep 22, 2003 5:13 AM
It's the sensor. My Polar also makes a faint tick. It's so faint that I can't hear it during riding. Not sure what it is...perhaps a small coil relay?
re: Astrale 8 magnet/sensor noise??Caseysdad
Sep 22, 2003 6:22 AM
Say it isn't so! If there's one thing that's worse than having to put up with an annoying "tick" during a ride, it's knowing that the tick is there even though you can't hear it.

Excuse me - I have to go tear up the floor boards to stop that infernal heartbeat...
Yup. That is it. nmOwenMeany
Sep 22, 2003 5:20 AM
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Ya, me too. Possible fixSpunout
Sep 22, 2003 9:08 AM
other than moving the sensor away from the spoke, is to slide the magnet towards the base of the sensor unit and not out towards the tip. I find that this makes it much quieter.