How to Connect hDrop Gen 2 to a Wahoo ELEMNT Bike Computer
Use hDrop Gen 2 with compatible Wahoo ELEMNT bike computers to see real-time hydration data during your ride and record sweat data into your FIT file.
Compatible Wahoo devices
hDrop Gen 2 is currently supported on the latest Wahoo ELEMNT bike computers:
- Wahoo ELEMNT ACE
- Wahoo ELEMNT BOLT 3
- Wahoo ELEMNT ROAM 3
Older Wahoo computers, including ELEMNT, BOLT 1, ROAM 1, BOLT 2, and ROAM 2, are not currently supported for hDrop connectivity.
Requirements
Before connecting hDrop to your Wahoo device, make sure you have:
- hDrop Gen 2 Hydration Sensor
- hDrop mobile app
- Wahoo app version:
- Android: 6.86.0 or newer
- iOS: 6.86.1 or newer
- Wahoo ELEMNT bike computer firmware:
- Version 3.25.2.3 / build 302533 or newer
- Bluetooth enabled on your phone and Wahoo device
- A saved Wi-Fi connection on your ELEMNT device if a firmware update is needed
What data appears on Wahoo?
When connected, hDrop can display and record:
- Fluid Loss: cumulative fluid loss during the ride
- Sodium Loss: cumulative sodium loss during the ride
These values are shown on your Wahoo ELEMNT data pages during the ride and are recorded into the ride FIT file.
Important: Wahoo currently records hDrop sweat data into the FIT file, but post-ride sweat analysis is done in the hDrop app. The Wahoo app and ELEMNT computer do not currently provide full post-ride sweat analytics.
Before your first ride
1. Update your Wahoo app and ELEMNT firmware
Make sure your Wahoo app and ELEMNT computer are updated to the required versions listed above.
If your ELEMNT needs a firmware update, your bike computer must be connected to a saved Wi-Fi network.
2. Set up your hDrop Gen 2 in the hDrop app
Open the hDrop app and make sure your hDrop Gen 2 is already paired and working correctly with the hDrop app before trying to connect it to Wahoo.
The hDrop sensor must be awake before pairing. To wake the sensor, make sure it has skin contact or is activated from the hDrop app.
3. Add hDrop data fields to your Wahoo workout profile
Open the Wahoo app and add the hDrop data fields to the workout profile you plan to use.
Follow this path in the Wahoo app:
Wahoo app > Devices > Your ELEMNT computer > Workout Profiles > Select profile > Pages > Select page > Add or replace data field > Sweat Analysis
Then choose:
- Fluid Loss
- Sodium Loss
You can add one or both fields depending on what you want to see during your ride.
Make sure your ELEMNT computer is connected to the Wahoo app so the data field changes sync to the device.
How to connect hDrop to Wahoo before a ride
hDrop Gen 2 can only connect to one Bluetooth device at a time. Because of this, you need to start the activity in the hDrop app first, then switch hDrop into external device mode so your Wahoo ELEMNT can connect to it.
Follow this sequence:
1. Open the hDrop app
Open the hDrop app and confirm your hDrop sensor is awake and available.
2. Start an Intense / Active activity
In the hDrop app, start a new Intense / Active activity.
This step is important because the hDrop sensor needs to begin recording before it is handed off to the Wahoo ELEMNT.
3. Open the hDrop settings menu
Tap the gear icon in the upper-right corner of the hDrop app.
4. Select Connect to External Device
In the hDrop app, choose:
Connect to External Device
Then select:
Use with External Device
This disconnects hDrop from the hDrop app so it can be found by your Wahoo ELEMNT bike computer.
5. Pair hDrop on your Wahoo ELEMNT
On your Wahoo ELEMNT device, go to:
Ready to Ride > Pair Sensor
or:
Settings > Sensors > Pair Sensor
Your Wahoo device should find hDrop as a Bluetooth sensor. Select hDrop to pair.
6. Confirm the connection
Before starting your ride, confirm that:
- hDrop appears as connected on the ELEMNT
- The hDrop sensor is worn correctly
- The Fluid Loss and/or Sodium Loss data fields are visible on your Wahoo data page
- The data fields begin showing values once the ride is underway
Wearing hDrop correctly
For best results, wear hDrop Gen 2 according to hDrop placement guidelines.
Recommended placements include:
- Back of the upper arm
- Chest strap placement, positioned as far forward as possible without covering heart rate monitor electrode contact pads
Make sure the sensor has good skin contact during the ride.
During the ride
Start your ride normally on the Wahoo ELEMNT.
Once hDrop is connected, your selected data fields will display during the ride.
Notes:
- hDrop sensor readings are taken at regular intervals.
- Sweat and sodium loss values update periodically during the ride.
- Data is recorded into the FIT file while the Wahoo ride is actively recording.
- If the Wahoo ride is paused, data transmitted during the pause may not be recorded into the FIT file.
After the ride
When your ride is complete, save the ride on your Wahoo ELEMNT.
After the ride is saved, the ELEMNT will temporarily disconnect from hDrop for about 15 minutes. This gives you time to reconnect hDrop to the hDrop app and sync your hDrop sensor data.
Then:
- Open the hDrop app.
- Select Use with hDrop App.
- Reconnect to your hDrop sensor.
- Sync the completed hDrop activity to the hDrop app.
This step is important because hDrop stores data onboard and syncs detailed sweat data back to the hDrop app after the ride.
Optional: Sync ride context to hDrop
For more complete post-ride analysis, you can connect your ride data ecosystem so hDrop can use additional workout context.
You can do this by connecting:
- Wahoo app to Apple Health or Android Health Connect
- hDrop app to Apple Health or Android Health Connect
This allows completed ride data to help provide more context for sweat analysis inside the hDrop app.
Troubleshooting
hDrop does not appear when pairing on Wahoo
Check the following:
- hDrop is awake.
- hDrop has already been set up in the hDrop app.
- You started an Intense / Active activity in the hDrop app.
- You selected Connect to External Device and Use with External Device in the hDrop app.
- hDrop is no longer connected to the hDrop app.
- Your Wahoo app and ELEMNT firmware are updated.
- Bluetooth is enabled.
- Restart the ELEMNT and try pairing again.
Fluid Loss or Sodium Loss does not appear in the Wahoo app
Make sure:
- Your ELEMNT is compatible: ACE, BOLT 3, or ROAM 3.
- Your Wahoo app is updated.
- Your ELEMNT firmware is updated.
- You are editing the correct workout profile.
- Your ELEMNT is connected to the Wahoo app so data field changes can sync.
Then force close the Wahoo app, restart your ELEMNT, and check again.
The data fields appear but show no data
Check the following:
- hDrop is connected in the ELEMNT sensor menu.
- hDrop is being worn correctly with good skin contact.
- The hDrop activity was started in the hDrop app before connecting to Wahoo.
- The sensor is not still connected to the hDrop app.
- You are using the correct Wahoo workout profile and data page.
I forgot to start the activity in the hDrop app before connecting to Wahoo
If hDrop is already connected to the ELEMNT but you forgot to start the hDrop activity:
- Open the hDrop sensor details page on the ELEMNT.
- Select Disconnect.
- Open the hDrop app.
- Start an Intense / Active activity.
- Select Connect to External Device.
- Select Use with External Device.
- Reconnect hDrop from the ELEMNT sensor page.
hDrop will not reconnect to the hDrop app after the ride
hDrop can only connect to one Bluetooth device at a time.
After saving your ride, the ELEMNT should automatically disconnect from hDrop for about 15 minutes so you can reconnect through the hDrop app.
If needed, you can also turn off the ELEMNT or manually disconnect hDrop from the ELEMNT sensor menu, then reconnect from the hDrop app.
Quick connection flow
Use this flow before each ride:
Open hDrop app > Start Intense / Active activity > Connect to External Device > Use with External Device > Pair hDrop on Wahoo ELEMNT > Start ride > Save ride > Reopen hDrop app > Use with hDrop App > Sync hDrop data
FAQ
Can hDrop connect to the Wahoo ELEMNT and hDrop app at the same time?
No. hDrop Gen 2 can only connect to one Bluetooth device at a time. Start the activity in the hDrop app first, then switch to external device mode so the Wahoo ELEMNT can connect.
Can I see hDrop data after the ride in the Wahoo app?
The Wahoo ELEMNT records hDrop data into the FIT file, but detailed sweat analysis is done in the hDrop app.
Does hDrop store data if it is connected to Wahoo?
Yes. hDrop Gen 2 has onboard memory and can sync with the hDrop app after the ride.
Which Wahoo computers support hDrop?
hDrop is supported on Wahoo ELEMNT ACE, BOLT 3, and ROAM 3.
Do I need to add the data fields manually?
Yes. Add Fluid Loss and/or Sodium Loss to your preferred Wahoo workout profile before the ride.