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Garmin edge 500 speed readings.

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Garmin edge 500 speed readings.

Old 01-03-13, 10:28 AM
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sstang13
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Garmin edge 500 speed readings.

I got a garmin edge 500 on Christmas, and have used it around 5 times now, and there's something wrong with the speed readings. During all of my rides so far, for some reason at any random point during the ride, the speed will drop to anywhere between 0.5-3.0 from what I've seen. As you may know, this will drop my average speed, and distance calculation significantly. I've even seen this happen with HR and cadence a few times. I know for sure that everything is aligns because it's still reading it throughout the ride, but I tried many ways while on the bike to fix this, but can't find any. If no one knows any solution, I'll send it back to get fixed. I just dont want to send it back if I don't have to because I need it for my training. Any help is appreciated, thanks.

Ps. I post this here because there's a lot of people on this forum and I know that many here use it and/or may be able to help.
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Old 01-03-13, 10:33 AM
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When my SC10 did that I sent it back to manufacturer per Garmin... was explained to me as a defect: wiring that attaches the arm of the SC10 was damaged el al. Once replaced the new SC10s didn't misbehave...

HR for me is typically bad contact... try spit on the contacts.
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Old 01-03-13, 10:34 AM
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Are you using a GSC-10 with it? With the GSC-10 speed and cadence sensor, and the unit set to the correct wheel size, speed is very consistent. Without it, whenever you have an interruption in signal, the speed drops (to 0.0 on mine), and then pops back on. Sometimes autopause will kick in, as it thinks that you are stopped.

I would think the impact to "average speed" is minimal, as "average speed" is d/t, and not the average of the numbers displayed on a screen.
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Old 01-03-13, 10:47 AM
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Do you have a link to one of your rides on Garmin Connect?
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Old 01-03-13, 11:25 AM
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Originally Posted by MikeyBoyAz View Post
When my SC10 did that I sent it back to manufacturer per Garmin... was explained to me as a defect: wiring that attaches the arm of the SC10 was damaged el al. Once replaced the new SC10s didn't misbehave...


HR for me is typically bad contact... try spit on the contacts.

Good to know, and ya I just lick my finger and rub it all over the two 'electrodes'.


Originally Posted by RollCNY View Post
Are you using a GSC-10 with it? With the GSC-10 speed and cadence sensor, and the unit set to the correct wheel size, speed is very consistent. Without it, whenever you have an interruption in signal, the speed drops (to 0.0 on mine), and then pops back on. Sometimes autopause will kick in, as it thinks that you are stopped.


I would think the impact to "average speed" is minimal, as "average speed" is d/t, and not the average of the numbers displayed on a screen.

Ya I'm using GSC-10. I'm riding down in my basement right now until the snow is gone, the satellite signal seems good enough to know what time it is all of the time, but I guess it could be the garmin temporarily loosing signal? Also seems that every time I ride, I'm at a different elevation? That seems a bit odd..


And yes I know that average speed is basically pointless, but it uses my speed to determine distance (I know this is true because when I'm on my indoor trainer, I would go nowhere). So either way I have no absolute measurement of my distance or speed.

Originally Posted by gregf83 View Post
Do you have a link to one of your rides on Garmin Connect?
No, my computer doesn't detect the device, but my computer is currently being fixed, so soon!
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Old 01-03-13, 11:34 AM
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The short bursts or decreases in speed are a part of GPS IMO. I'll often see that I'm riding at a steady pace and then it'll drop or jump for a millisecond. When I look at the data on the computer though, it's all evened out. And in the big picture, meh.
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Old 01-03-13, 11:46 AM
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Originally Posted by sstang13 View Post
Good to know, and ya I just lick my finger and rub it all over the two 'electrodes'.





Ya I'm using GSC-10. I'm riding down in my basement right now until the snow is gone, the satellite signal seems good enough to know what time it is all of the time, but I guess it could be the garmin temporarily loosing signal? Also seems that every time I ride, I'm at a different elevation? That seems a bit odd..


And yes I know that average speed is basically pointless, but it uses my speed to determine distance (I know this is true because when I'm on my indoor trainer, I would go nowhere). So either way I have no absolute measurement of my distance or speed.



No, my computer doesn't detect the device, but my computer is currently being fixed, so soon!
Turn your GPS off if youre riding inside. Its probably fighting itself to read your speed via gps and the wheel speed sensor. Keep it off indoors. You gotta turn it off each time, as it will be back on next time you fire it up.
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Old 01-03-13, 11:58 AM
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Originally Posted by androidtt View Post
The short bursts or decreases in speed are a part of GPS IMO. I'll often see that I'm riding at a steady pace and then it'll drop or jump for a millisecond. When I look at the data on the computer though, it's all evened out. And in the big picture, meh.

Ya but mine can drop my average speed by 2 km/h just by being down like that for 30 seconds.

Originally Posted by evan938 View Post
Turn your GPS off if youre riding inside. Its probably fighting itself to read your speed via gps and the wheel speed sensor. Keep it off indoors. You gotta turn it off each time, as it will be back on next time you fire it up.
Wow, this is why I post here, instead of bringing it in and finding nothing wrong with it, all I have to do is turn off the GPS... thanks everyone, if there continues to be problems I'll post back here, if not than thanks anyway!
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Old 01-03-13, 01:45 PM
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my autopause/start goes on and off when my bike is not moving =/
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Old 01-03-13, 02:18 PM
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Originally Posted by evan938 View Post
Turn your GPS off if youre riding inside. Its probably fighting itself to read your speed via gps and the wheel speed sensor. Keep it off indoors. You gotta turn it off each time, as it will be back on next time you fire it up.
The head unit will always take speed from the cadence sensor first if it is enabled. There is no conflict unless it is losing communication with the GSC-10 unit entirely. I have NEVER had that trouble on my trainer in my living room and I never turn off GPS.

Somewhere in this forum someone posted the priority of installed devices I believe it goes:

Power = Power meter only
Cadence = Power meter, then cadence sensor
Speed = Power meter (where applicable), cadence sensor, then head unit (GPS)

Originally Posted by Impreza_aL View Post
my autopause/start goes on and off when my bike is not moving =/
might try and raise your cut-off for the auto-pause
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Old 01-03-13, 02:26 PM
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If its trying to get signal, itll be wacky. Before i realized it. Id have time on the trainer where itd look like a crazy 32 pointed star from the gps estimaing my location. Never had the issue when i turned off the gps sagellites. Ill find the page on my garmin connect when i get home as they dont like to show up on my phone.
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Old 01-03-13, 03:07 PM
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Originally Posted by evan938 View Post
If its trying to get signal, itll be wacky. Before i realized it. Id have time on the trainer where itd look like a crazy 32 pointed star from the gps estimaing my location. Never had the issue when i turned off the gps sagellites. Ill find the page on my garmin connect when i get home as they dont like to show up on my phone.
Yeah, I have that, but you're on a trainer, so you should already know where you are...

The concern is when the speed readings are all over the place [not the location readings], which shouldn't happen if the GSC-10 is functioning properly.
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Old 01-03-13, 06:04 PM
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Just disable the GPS before every trainer ride. Despite what Garmin says or the documentation, having the GPS searching for a signal from your basement will cause erroneous readings.
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Old 01-03-13, 10:29 PM
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This is perhaps slightly off topic, but for the HR monitor I always use a drop of electrode gel (it's on Amazon for like $9 and lasts forever) and have never lost a signal with my Garmin or the Polar I used to use.
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Old 01-03-13, 10:51 PM
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Originally Posted by kaimat View Post
This is perhaps slightly off topic, but for the HR monitor I always use a drop of electrode gel (it's on Amazon for like $9 and lasts forever) and have never lost a signal with my Garmin or the Polar I used to use.
the HR monitor i always use i always lick my thumb and run it across the back. its free and always available and i dont have to carry anything extra with me. i've never lost a signal with my garmin

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Old 01-03-13, 11:05 PM
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Originally Posted by evan938 View Post
the HR monitor i always use i always lick my thumb and run it across the back. its free and always available and i dont have to carry anything extra with me. i've never lost a signal with my garmin

That's certainly a tried and true method, but I've found it works much better in warmer weather than cold. When it's really cold out, the gel is the best way to get accurate readings because without it you basically have to wait until there's enough warmth/sweat from your chest before you get an accurate HR reading.
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Old 01-04-13, 07:25 AM
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Originally Posted by MikeyBoyAz View Post
Cadence = Power meter, then cadence sensor
Other way around
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Old 01-04-13, 07:29 AM
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stoplights can trigger this effect.
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Old 01-04-13, 07:51 AM
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The speed/cadence sensor (SC10) might be bad. Did you try putting a fresh battery in it? If the flashing LED reset procedure confirms that the sensor is picking up the wheel and crank magnets, all should be good. The other possible cause is the positioning of the wheel magnet. If off just a bit, it might not be picked up when sprinting. Try adjusting the magnet, give the wheel a spin and make sure the head detects both the crank and wheel magnets. You shouldn't have to turn off gps in this situation.
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Old 01-04-13, 10:46 AM
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Originally Posted by thechemist View Post
stoplights can trigger this effect.
Not if you ride right through them..
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Old 01-04-13, 11:36 AM
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Originally Posted by plantrob View Post
Other way around
Do you have documentation? Experience says power meter first, THEN cadence sensor.
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Old 01-04-13, 12:02 PM
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Did you pair the GSC-10 with the 500 unit?
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Old 01-04-13, 03:34 PM
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Originally Posted by MikeyBoyAz View Post
Do you have documentation? Experience says power meter first, THEN cadence sensor.
Indeed.

I've taken to "waking up" my cadence sensor with a magnet BEFORE waking up my PowerTap. Seems to work - most times anyway.

And FWIW, wireless devices/networks/phones can and will interfere with the ANT+ signal.
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Old 01-04-13, 04:09 PM
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Originally Posted by achoo View Post

And FWIW, wireless devices/networks/phones can and will interfere with the ANT+ signal.
My Edge 500 is coming on Monday. I'm hoping this isn't the case, since I ride with my phone in my jersey pocket. I can't imagine this is the case, or else anyone with a Garmin would be forced to ride without their phones?
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Old 01-05-13, 11:40 AM
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Originally Posted by sstang13 View Post
Good to know, and ya I just lick my finger and rub it all over the two 'electrodes'.
I tried wetting my skin and also using electrode gel. Wetting the electrodes and rubbing it in works the most reliably for me. I use water but I assume spit would be just as good, maybe better...
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