The Kettler RE7 is an older but comfortable ergometer that can be connected to a modern training setup with QZ. Originally designed around proprietary PC software, the RE7 has a USB-B port that can be used as the starting point for a QZ bridge.
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The Kettler RE7 and its original connection
The Kettler RE7 is a recumbent ergometer with a comfortable seat, an integrated training console and a USB-B connection intended for communication with a computer. That connection was originally useful for proprietary Kettler software, but it can also provide a practical path into a newer multi-device setup.
For riders who still enjoy the bike but want to use modern training applications, QZ can act as the compatibility layer between the ergometer and the software they prefer.
The confirmed QZ setup
A real owner connected the Kettler RE7 to QZ using an Android phone, a USB OTG adapter and the bike’s USB-B port. The Android phone handled the physical bike connection, while an iPad connected to QZ over Bluetooth for the training software.
| Component | Confirmed setup |
|---|---|
| Exercise bike | Kettler RE7 Ergometer |
| Bike connection | USB-B port |
| QZ device | Android phone |
| Adapter | USB OTG cable |
| Serial speed | 57,600 baud |
| External display/training device | iPad connected to QZ through Bluetooth |
The important Android USB setting
The first connection attempt showed the most common obstacle in this kind of setup: Android treated the USB connection as phone charging only. The working configuration required Android Developer Options and a USB mode that forces the connection to use data rather than charging only.
After that change, together with the correct 57,600 baud setting, QZ could communicate with the Kettler RE7. The iPad could then connect to QZ wirelessly, turning the older ergometer into part of a current two-device training workflow.
What QZ adds
QZ is designed to bridge fitness equipment and training applications. Its general bike feature set includes customizable metric tiles and profiles, heart-rate connections, heart-rate zones, workout recording and support for compatible apps such as Zwift, Rouvy and Wahoo RGT. The public QZ feature list also documents virtual-device workflows, automatic resistance features for supported equipment, workout files and routes, and integrations such as Strava, Apple Health/HealthKit, Google Health Connect, Garmin FIT, email reports, MQTT, Open Sound Control, text-to-speech and Bluetooth accessories.[2]
These are general QZ capabilities. The exact metrics and controls available from a Kettler RE7 depend on the connection profile and on the data exposed by this particular bike. The confirmed owner report establishes the USB-to-QZ connection and the Bluetooth link to the iPad; it does not claim that every QZ control or every training application has been independently tested on the RE7.
Android phone plus iPad: a practical layout
The two-device arrangement keeps each device focused on one task:
Kettler RE7
|
| USB-B + OTG
v
Android phone running QZ
|
| Bluetooth
v
iPad running a training appThe Android phone can remain near the bike and manage the equipment connection, while the iPad provides the larger screen and the preferred training application. This is useful when the rider wants to keep the existing ergometer but replace its outdated software environment.
How to connect the Kettler RE7 to QZ
- Connect the RE7 USB-B port to the Android phone with a suitable USB OTG adapter.
- Install a current QZ Android build and allow the required USB and Bluetooth permissions.
- Enable Android Developer Options if the phone does not expose the required USB data setting.
- Set the USB connection to use data, not charging only.
- Select the applicable Kettler or USB/serial connection path in QZ.
- Use 57,600 baud for the confirmed RE7 setup.
- Confirm that the bike connection is active and that QZ is receiving the available values.
- Open the training application on the iPad and pair it with the Bluetooth device exposed by QZ.
- Start with a short test session before relying on the setup for a longer workout.
Troubleshooting the connection
- If Android reports charging only, check Developer Options and select a USB data mode.
- Verify that the OTG adapter supports data, not only charging.
- Try another USB-B cable if the phone does not detect the ergometer.
- Close other Bluetooth fitness apps so they cannot claim the connection first.
- Confirm the baud rate is set to 57,600.
- Make sure QZ is connected to the physical bike before opening the training app on the iPad.
A practical second life for the Kettler RE7
The Kettler RE7 was designed for an earlier generation of training software, but a reliable piece of equipment does not become obsolete simply because its original application is outdated.
With the correct USB connection, QZ can provide a bridge between the RE7 and a modern Bluetooth training setup. In the confirmed configuration, the Android phone handled the bike connection and the iPad handled the training application. That gives the rider a more flexible software environment without replacing a comfortable older ergometer.
Kettler RE7 → USB-B → QZ on Android → Bluetooth → training app on iPad.
If something does not work as expected, send an email to Roberto.viola83@gmail.com and Roberto will help you check the setup.
Learn more about QZ at qzfitness.com and review the QZ Fitness App Guide.
Sources
- Kettler RE7 product page and image source — product identification and image attribution.
- QZ feature list — documented QZ capabilities and integrations.
- QZ Fitness App Guide — connection, Bluetooth and workout workflow guidance.
- QZ GitHub repository — public project source.