Beachgrad05

Don't want to start a new thread for my issue/question. It is in a similar ballpark so here goes:

I got my new Domane in December. I purchased a Duo-Trap with Bluetooth (the Domane uses the old style outside on the chainstay mounting and won't work with the Duo-Trap S which uses an inside mounting). My Madone uses the Duo-Trap but it is the old one without Bluetooth.

I use a Garmin Edge 500 and I have the older HR chest strap.

I have had issues with two things that I am noticing on the Domane but not the Madone.

1. My Garmin auto-pauses and immediately auto-resumes while I'm moving.
2. My HR is intermittently not being displayed on my Garmin

When I rode the Madone recently I don't recall having either of these issues.

When I look at my data - I don't see a drop to zero for my HR for the time it was not displaying so am wondering if it is being transmitted but not displaying on the Garmin for some reason.

Any thoughts as to the Bluetooth capability mucking up things?

lynch.cr

I have had a similar issue of auto-pause/auto-resume with my wife's Silque SL. She has a Garmin 500 and the bluetooth capable DuoTrap. I'm in the process of trying to isolate the issue, but to no avail as of now.

I have a Domane with a Garmin 500 and DuoTrap and never had an issue with the connection.

Both of our Garmins are mounted with barfly mounts.

Beachgrad05

Wonder if this is issue. I have a K-Edge mount for my Garmin on the Domane but use a stem mount on the Madone. Interesting. May have to try putting stem mount on Domane and seeing if issue persists.

RNAV

I use the Garmin-supplied stem mount and have problems.

I have done a tremendous amount of fault-tracing and can only conclude that there is a systemic problem with Trek's DuoTrap S sensor. I would encourage you to press Trek to warranty your sensor. If they start getting enough warranty requests, perhaps they'll actually take enough interest in this problem to come up with a solution.

Beachgrad05

Mine isn't the Duotrap S but the new Bluetooth version of the older style Duotrap

RNAV

The issue exists with all of Trek/Bontrager's sensors that broadcast both ANT+ & Bluetooth. The ANT+ - only sensors don't have connectivity issues.

Personally, after 5 warranty replacement sensors, two different Garmin units, and a plethora of various rare earth metal magnets, I've simply given up on ever having it function correctly. Trek doesn't think it's a real problem. Which is frustrating, because the advertised feature of the frame-integrated dual ANT+/Bluetooth DTS sensor was one factor that influenced my decision to purchase a Trek Emonda.

McFlurrey06

Never had a problem. Edge 500 and older DuoTrap.

Beachgrad05

Of course you haven't. That is not the subject of this thread. Newer ones ARE having issues after they added Bluetooth capability. I have OLDER duo trap w/o Bluetooth and no issues. It is on new bike with the NEW version of the duo trap that has Bluetooth I have issues.

seems those with the Duotrap S are also having issues.

Dylnger

So, I have an emonda sl6 and after reading this thread decided not to use the duotrap and instead purchased this,https://buy.garmin.com/en-US/US/shop...rod146897.html I have also had auto pause and restarts since the day I installed it. I do not have a heart rate monitor so no help there. Today I was riding a different set of wheels and forgot to attach the speed sensor to the hub. I was half way through my ride before I noticed because the garmin edge 500 was using gps speed. When I got home I realized that not once did I have an auto pause restart. Not that it solves your problem but try removing the speed sensor magnet and let us know what happens.

RNAV

I tried that and my Garmin wouldn't register any speed at all. I tried pairing the DTS as a cadence-only sensor, and it wouldn't pair like that, nor would it pair as a speed sensor and cadence sensor separately . . . only as a combined speed/cadence sensor.

DonBjr

Interesting... I was suspicious of that from the beginning. It occurred to me early on that perhaps the Bluetooth signal was interfering with the ant+ signal. Did it work ok with Bluetooth/Strava when you tried that?

It would be nice if you could turn off the Bluetooth part or if you could configure the Garmin to pick up the cadence while using GPS for speed. (sigh...)

DonBjr

Update... finally got around to testing some things. I have an emonda sl6 size 64 with duotrap s. I tested again today on my trainer. Suunto Ambit2 watch using ant+ still has drops on speed, though cadence relatively stable. Trainer software I have picking up cadence with ant+ and it's ok there also. My wife's Garmin 510 with ant+ has speed drops like the ambit2 (didn't look at cadence). Using my android galaxy s5 and IpBike app I picked up the sensor with bluetooth and speed looked good.

So... it seems no ant+ device I've tried gives me reliable speed, but bluetooth appears to be ok. Not sure what my bluetooth head unit options are. I don't want to use my phone. I only installed IpBike just to test it.

GlennR

The weather finally go nice enough to ride so in the past week i've put 150 miles on my Emonda with Duo Trap S and not a single drop.

I also have a Duo Trap S on my Trek Dual Sport and no drops on it. I did have a problem with the magnet not triggering the Duo Trap S cadence but I found putting a piece of rubber between the magnet and the crank arm to move it closer to the Duo Trap S fixed that.

You might try that.

busrydr

Oldnslow2, what computer are you using?

I've been following this thread in hopes of a solution would surface, the same as the original poster. As he has, I've tried just about everything mentioned.

It really seems to be the combination of the Garmin 500, Emonda SLR frame and the Duo Trap S working together that produces this issue.

I have not reached out to Trek or Garmin, but I will just so they have another registered incident on record.

cydewaze

I just picked up the Duo Trap S. Works flawlessly for me.

GlennR

Garmin 510.

busrydr

What computer are you using?

cydewaze

Garmin Edge 510.

busrydr

RNAV,

I may have missed it if you stated somewhere earlier, but what wheel set are you using?

RNAV

Bontrager TLR Race X Lites.

I'm noticing a trend that 510 owners are experiencing this problem. I don't own a 510 . . . is it possible to ascertain if the 510s are connected to the DTS via ANT+ or BT?

GlennR

I've got about 400 miles with no problems.

busrydr

Okay, I confirmed you had the exact same issue I had with all the same components right down to the wheels.

I know you've tried everything, but try one more.

After I reached out to Trek and Garmin, I got a tip that solved my issue.

Here's my detail:

After experiencing the exact same symptoms a you (OP) I searched the net and found this thread. I has the following set up:
- Emonda SLR Frameset in size 60cm
- Duo Trap S speed/cadence sensor
- Garmin 500 stem mounted with out front Barfly mount

From the first day I set up the bike (this was a frameset build) I had the problem of dropping speed.

Here is where I believe the issue was, at least for me. I also had a set of Bontrager RXL TLR wheels and I was using a Bontrager aero wheel magnet.

That same wheel set and magnet was used on a previous bike with the same Garmin 500, same wheel magnet and the original Duo Trap speed/cadence sensor without issue.

When I set up the Emonda build, I noticed that the RXL rear wheel spoke was very very close to the ideal spot on the Duo Trap sensor. And once the Bontrager Aero wheel magnet was put in place, it was almost touching the sensor when the wheel was rotated. It appeared that sliding the magnet past the end of the sensor was the only way to mount it. Testing the indicator light when spinning the wheel showed the magnet was activating the sensor, every time. So no indication of an issue at this point.

After riding and having the problem with auto pause on every ride, I did try and reposition the magnet, but it always checked okay when testing and nothing seemed to prevent the auto pause condition from occurring. So I looked elsewhere.

I also have a set of Aeolus carbon wheels. While the magnet has much better clearance from the sensor, I still got the same auto pause problem with those wheels as well. Just not as much.

Well, after riding blind in the Sea Otter Classic Grand Fondo this past weekend for some reason it was zero more that correct and my recorded distance was drastically impacted), I was either going to dump the Garmin 500 or find a cure. Finding a cure was a lot less expensive.

Following a tip from a Trek tech at the Sea Otter Classic event and seeing that I had a lot less drops when using the Aeolus wheels with a better clearance between the magnet and the sensor, I opened my bag of tricks and pulled out 7 different types of wheel magnets I had collected over the years.

Most were too thick to work as they would contact the sensor on rotation once installed. But I was in luck as I had a wheel magnet branded as a Mavic Model #M40540 that had a slim enough profile to fit. This allowed me to position the wheel magnet dead center over the sweet spot of the sensor.

As before, the test by spinning the wheel and getting the magnet to activate the sensor passed. But the real test was get out and ride.

I am happy to report that after a 25 mile ride, I had zero speed drops/pauses recorded on my Garmin.

If you look at how the Duo Trap S fits into the Emonda SLR frame, you can see that the rubber gasket allows some play in the fit at the back of the sensor. That play is likely enough to alter the spacing between the magnet and sensor when riding. In my case, using the Bontrager Areo wheel magnet just did not allow enough space for a correct sensor register at all times.

Try it out and let us know what happens.

RNAV

@busrydr,

Thanks for the detailed post! My take-away from your experiment is that the DTS needs less magnetic force applied to it -- not more -- to function properly. That is exactly opposite of what my experimentation had involved . . . I was working toward increasing magnetic force. Interesting!

I'll see what I can do to increase the distance between the DTS and the wheel magnet and report back. Could be a Goldilocks issue.

DonBjr

Any luck? I've just read this. I might try sliding the magnet around on the spoke a bit. On mine, the magnet it comes with is close, but never touches no matter what the position. Maybe there's a position where it will work better. Might also be some interference from the cadence magnet, so an adjustment there might help too.

txags92

Interesting! Let us know if it works. I have an SL frame with a Garmin 500, DTS, and Race Lite wheels. I do have maybe 4-5 dropouts per 40 mile ride or so, but they usually last about 1-2 seconds and are more minor annoyance than a real issue. But it would be nice to have such a simple solution.