How to set up your Trek CarBack bike radar

Know what’s coming with CarBack

The Trek CarBack bike radar and rear light helps you see and be seen thanks to an integrated daytime running light and radar technology that can detect rear-approaching vehicles from up to 240 m away.

Ready to set up your radar? Read on to learn how to pair CarBack with your GPS head unit or download the Trek Accessory app to use CarBack with your smartphone and unlock even more useful features.

First-time tips

•To turn on, press and hold the power button for one second
•To turn off, press and hold the power button for one second
•When CarBack is off, a single quick press will show its battery status
•CarBack will need to be turned on in order to pair with your GPS unit or phone
•For the best possible experience, your radar should be between 70 and 120cm from the ground, facing backwards, completely level and not blocked by a rear wheel, mudguard, bag, etc.
•You can mount your CarBack using the included Quick Connect Plus mount or a Blendr accessory mount that integrates with select Trek and Bontrager saddles.

Pairing CarBack with your smartphone in six easy steps

Step 1. Download the Trek Accessory app
Step 2. Turn CarBack on with a one-second push
Step 3. Open the Trek Accessory app
Step 4. Select your CarBack to continue to setup
Step 5. Choose your distance and audio settings
Step 6. Finish setup and you’re ready to ride!

Know more with the Trek Accessory app

When you pair your CarBack bike radar with the Trek Accessory app, you can see the exact location of oncoming vehicles and whether or not they’ve moved over for safer passing.

Pairing CarBack to your GPS

•CarBack will need to be turned on in order to pair with your GPS unit
•Follow the instructions included with your device to pair with a sensor
•For detailed instructions on adding CarBack as a sensor to your computer, see your device’s instruction manual: