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polar s710 question(9 posts)

polar s710 questionocbuckeye
Jun 26, 2003 10:57 AM
i have a polar s710 that works fine on my mtb, on my road bike the speed constantly starts and stops while i'm riding. i don't think it is interference because it works when i ride my mtb on the same road. the speed sensor on my road bike is only 2 weeks old, the battery should be good. i've even tried moving the sensor up and down on the fork. i was wondering if any body else has had this problem. any help would be appreciated. thanks.
re: polar s710 questiondivve
Jun 26, 2003 11:26 AM
If it's not the battery it could be a magnet problem. Both my wheelsets have skinny bladed spokes and I couldn't get the plastic Polar magnet to work reliably no matter how close I modified it to pass the sensor (didn't even bother with the included clunky metal one). I solved the problem with the extremely strong and light Tune magnets. Depending on the side you mount the magnet it's compatible with both thin bladed or round spokes.
re: polar s710 questionocbuckeye
Jun 26, 2003 11:59 AM
i am using the mavic ksyrium magnet, i will try it with a different one and see if that makes a difference. thanks
Speed Sensor modcarpe_podium
Jun 26, 2003 1:39 PM
Your MTB speed sensor may have the jumper set to the high value and your road bike speed sensor jumper in the low or medium position. The polar manual lists how to change this. I swapped the jumper on mine and my speed dropout problems went away. I'm using a ksyrium magnet as well. The downside to the high power option is that the battery will not last as long. If you can't locate the jumper setting instructions let me know. I think I have a page bookmarked at home and I'll post a link.
Speed Sensor modocbuckeye
Jun 26, 2003 2:00 PM
i've got the manual at home, i'll check the jumper setting.
Speed Sensor modocbuckeye
Jun 26, 2003 3:49 PM
any idea where they hide that info in the manual? i've checked the 710 and the speed sensor manual both and i can't find any jumper info. thanks
Here's a linkcarpe_podium
Jun 27, 2003 5:34 AM
Here's a linkocbuckeye
Jun 27, 2003 8:42 AM
thanks, i set it on the high setting and it works perfectly now.
I had the same problem and........Len J
Jun 27, 2003 3:43 AM
solved it by rotating the watch/receiver so it was not facing me but rather flat on the handlebars. May or may not work for you.

If it doesn't, you can increase the speed sensor power output. I think they come from the factory set on low with a med and high option. Go to the Polar website technical section and I think there is a how to.