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Polar speed sensor(7 posts)

Polar speed sensorjuanteal
Apr 15, 2003 6:45 AM
I'm a good enough mechanic to completely assemble a bike in an afternoon, yet I can't get the damn speed sensor for my Polar 720 to work.

What's the deal? Is there some sort of black magic solution?
No Black magic solution required........Len J
Apr 15, 2003 7:06 AM
just some basic stuff.

You don't detail the problem you are having, so I'll give you some general guidelines, issues to check:

1.) Battery. When was the last time you checked the battery in the sensor?

2.) I have found that the closer I can get the sensor to the receiver, the better the reception. I have mine as far up the fork as practicle.

3.) Level the receiver. My reception improves when I have the watch level on the handlebar (not tilted towards me).

4.) Have you made sure the bike capabilities of the Polar have been turned on?

5.) Is the Sensor within 5MM of the magnet?

6.) Is the magnet facing the correct direction? (Don't laugh, I chased a problem on my wifes bike for an hour before I realized I had put the magnet on backwards.)

That's all I can think of.

Len
Thanks a lot! I'll troubleshoot tonight (nm)juanteal
Apr 15, 2003 7:43 AM
One more thought........Len J
Apr 15, 2003 9:21 AM
to check the battery in the sensor, rotate the magnet by the sensor & you should see a light flash briefly in the sensor.

Good luck & let me know what you find.

Len
And anotherTrekFurthur
Apr 15, 2003 10:52 AM
my sensor doesn't like the magnet to be centered on it . . . picks up when the magnet is offset to the top or bottom of the sensor.
Solution: sensor too far from watchjuanteal
Apr 16, 2003 5:12 AM
I tried a couple of things last night, but I'm pretty sure the problem was the sensor+magnet were too far from the watch. I had the sensor set up at the bottom of the fork where it's the narrowest, because my Columbus Muscle fork is so fat that for most of the length of the fork, it's only a few mm away from the spokes. Then with the magnet sticking out, there's not even enough clearance for the zip ties!

Originally, I had the watch mounted on the handlebar side opposite the sensor (watch left of stem, sensor on right [starboard] fork leg). I never thought that would have mattered. It hasn't been tested anywhere but the workstand, but it seems that moving the watch mount to right side of the stem fixed the problem.

Thanks for the help!
I have my sensor mounted on my seatstay...SS_MB-7
Apr 16, 2003 8:04 AM
I have my speed sensor mounted on my seatstay since my bike is mounted in my Kurt Kinetic trainer. Granted, I'm on a smallish frame (50.5cm c-c), but I have not encountered any problems with this set-up.

Ride Hard,
Mike B.