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Bontrager DuoTrap S Digital Sensor

Old 11-08-20, 04:58 PM
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LazyMike
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Bontrager DuoTrap S Digital Sensor

Which app works with this on iPhone, tried Wahoo and no luck.
Cyclemeter app paired with the Bluetooth but didn't register speed, it would just circle and say searching or would pop up and say N/A.
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Old 11-08-20, 07:15 PM
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Originally Posted by LazyMike View Post
Which app works with this on iPhone, tried Wahoo and no luck.
Cyclemeter app paired with the Bluetooth but didn't register speed, it would just circle and say searching or would pop up and say N/A.
I use Cyclemeter on an iPhone with three Duotrap S-equipped bikes with no issues. When you spin up the bike prior to pairing, are you getting red and green lights on the sensor for the first ten revolutions of the crank and wheel? And are you pairing the sensor in the Cyclemeter app itself, or using the Bluetooth utility in the iPhone's settings? The pairing should be done entirely within the Cyclemeter app - you don't need the iPhone's settings utility for anything (other than making sure Bluetooth is on).

Last edited by ScottRiqui; 11-14-20 at 05:28 PM.
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Old 11-08-20, 08:10 PM
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Originally Posted by ScottRiqui View Post
I use Cyclemeter on an iPhone with three Duotrap S-equipped bikes with no issues. When you spin up the bike prior to pairing, are you getting red and green lights on the sensor for the first ten revolutions of the crank and wheel? And are you pairing the sensor in the Cyclemeter app itself, or using the Bluetooth utility in the iPhone's settings? The pairing should be done entirely within the Cyclemeter app - you don't need the iPhone's settings utility for anything (other than making sure Bluetooth is one).
I'm helping a friend, will try this out.

Thanks.
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Old 11-08-20, 08:24 PM
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Originally Posted by LazyMike View Post
I'm helping a friend, will try this out.

Thanks.
Here's a little more detail - I hope it helps.

Spin the crank/wheel and make sure you get the red and green lights (they might not come on if they've been triggered recently).

Now that the sensor is awake, In the Cyclemeter app, click on the three dots in the bottom-right corner that say "more". Then select "Devices."
At the top-right of the "Devices" page, click on "+/Edit."
Choose "Add Bluetooth" on the pop-up that appears.
It will say "scanning", and then the Duotrap sensor should appear. If you spin the crank now, the phone should be telling you the cadence and speed, along with the signal strength and the battery level.
After it pairs, you can click on the sensor, rename it if you want to, and make sure that "bike speed" is on and "Bike Cadence" is selected.

Last edited by ScottRiqui; 11-08-20 at 08:29 PM.
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Old 11-14-20, 05:06 PM
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Scott-

thanks for the help so far....its helped a lot.

ok, got the app to recognize the sensor.....did the tire size ....but have to make an adjustment and not sure what to do. the speed is way off......barely going and it says that we are riding 21 mph.....but that is not correct as its only a few mph. what do we fix next ?
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Old 11-14-20, 05:21 PM
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Originally Posted by bxcsvc24a View Post
Scott-

thanks for the help so far....its helped a lot.

ok, got the app to recognize the sensor.....did the tire size ....but have to make an adjustment and not sure what to do. the speed is way off......barely going and it says that we are riding 21 mph.....but that is not correct as its only a few mph. what do we fix next ?
Glad to hear you're making progress!

Here's what to try next (I'm assuming that you've gone on an outdoor ride at least a few minutes long, so that the app has collected data from both the GPS and the wheel speed sensor. If not, go do that first):

From the main screen in Cyclemeter, click on the three dots ("More") at the bottom-right of the screen.
Click "Settings," and then "Bike."
Click "+/Edit" at the top-right of the screen, and then select your bike.
Look at the "Wheel Diameter" - it should say something that's at least believable, probably in the neighborhood of 25-27 inches.

Click on "Wheel Diameter," and look at "Last Wheel Size." That's what the app is estimating your wheel diameter to be, based on constantly comparing your GPS speed with the RPM from your wheel speed sensor. If it looks believable (again, at least close to 25-27 inches), click on "Use Last Wheel Size," and it will update your bike's wheel diameter with this calculated value. While you're on this page, make sure it says "Diameter" next to "Wheel," and "Inches" next to "Units."

Good luck - keep us posted.

Last edited by ScottRiqui; 11-14-20 at 05:29 PM.
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Old 11-14-20, 05:54 PM
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yeah, I see what I had wrong....it was in mm instead of inches. i fixed that and things seem more " normal " now. will do a test ride tomorrow .

thanks for the help

will update tomorrow.
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Old 11-15-20, 02:19 PM
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before we decided to use this bontrager / cyclemeter app, we used to use mapmyride and after each ride, it would always give you two distances.....so was never sure which one was the actual one.

went for a ride this morning and not sure if the speed is right as again, going based on the mapmyride app and what that used to say, but it might be close. i started with going to what I know is 5 miles and this bontrager / cyclemeter app says 5 miles is before the actual distance , where the mapmyride is past the 5 mile mark......so I guess it all depends on which app you use , but both are very close.

i was having issues with the mapmyride app logging the ride as it would just pause itself for no reason.......so that is when we decided to do the bontrager / cyclemeter app and there are a lot of extra things to use on the cyclemeter app and just have to play around with it .

thanks again for your help on this Scott.....
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Old 11-17-20, 09:59 PM
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I recently put these on my Domane and Emonda and both of them I had to install new batteries. Once of them died on a ride and after I got the second one, I could not even get it to work until I put a new battery in it. My cadence was intermittent and the speed was way off. Once I replaced the batteries, it was perfect. All in all, I think they are great.
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Old 11-18-20, 03:33 AM
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jaxgtr.......what app are you using with this bontrager duotrap sensor ?
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Old 11-18-20, 07:33 AM
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Originally Posted by jaxgtr View Post
I recently put these on my Domane and Emonda and both of them I had to install new batteries. Once of them died on a ride and after I got the second one, I could not even get it to work until I put a new battery in it. My cadence was intermittent and the speed was way off. Once I replaced the batteries, it was perfect. All in all, I think they are great.
That's interesting - I had a hard time finding anyone who had them in stock a few months ago, so I'm surprised that any have been sitting around on the shelf long enough for the batteries to go dead. I'm glad that all you needed were fresh batteries, though.
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Old 11-18-20, 07:39 AM
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Originally Posted by bxcsvc24a View Post
jaxgtr.......what app are you using with this bontrager duotrap sensor ?
I capture it using my wahoo roam computer or my wahoo kickr core trainer. I upload to ride with gps.
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Old 11-18-20, 07:42 AM
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Originally Posted by ScottRiqui View Post
That's interesting - I had a hard time finding anyone who had them in stock a few months ago, so I'm surprised that any have been sitting around on the shelf long enough for the batteries to go dead. I'm glad that all you needed were fresh batteries, though.
Yea, I had been looking for them as well, but when I ordered my Domane, I bought it at the same time, so that is how I got them. I think Trek has them in stock on their website though, did not even thinking of checking there honestly at the time.
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