# Trek Accessories — Use with Trek CarBack Radar > Cycling safety app with rear vehicle detection and bike light control. (iPhone/iPad app by Trek Bicycle.) - Source: https://appshunter.io/ios/app/trek-accessories/id6468969662 (this page in markdown: same URL + `.md`) - Developer: [Trek Bicycle](https://appshunter.io/developer/780864901) - Category: Sports, Health & Fitness - Price: Free - Rating: 4.70/5 from 184 App Store ratings · 11 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 28 MB - Languages: British English, Czech, Danish, Dutch, Finnish, Canadian French, German (Germany), Italian, Japanese, Norwegian Bokmål and 6 more - Released: 2024-04-17 - Data updated: 2026-08-28 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/trek-accessories/id6468969662/reviews.md ## What is Trek Accessories? The Trek Accessories App adds additional functionality to the Trek CarBack Radar Rear Bike Light by giving cyclists advanced alerts and a real-time visual depiction of rear approaching detected vehicles. Helps you see cars. Use the Trek Accessories App to receive visual and audible alerts of detected rear approaching vehicles. The Trek Accessories App and Trek CarBack Radar can detect rear approaching vehicles from up to 240M, with vehicles first appearing with an audible beep and a visual indicator at the bottom of the App screen. Once the detected vehicle approaches to within 150M, the vehicle is shown on screen in real time. Once within 75M the Vehicles location is depicted in both distance behind and distance to either side, indicating preparation for a potential pass. Once the vehicle completes a pass, an audible alert indicates the pass and the vehicle drops off the screen. Helps cars see you. The Trek Accessories App also gives the ability to turn on a connected Trek CarBack Rear bike Light, all from the App screen. The CarBack Radar offers Daytime Running Light Performance that can be seen from up to 2km during the day to help a cyclist be more visible on the road. Audible and Visual Alerts You can choose the best way to receive alerts – Alerts will be shown visually on screen as well as an audio alert when a detected rear approaching vehicle is first detected, and again when it passes. You can choose to turn audible alerts on and off. This allows you to use the app the way you ride – either with a phone mounted on your bike’s handlebars, or stowed in a jersey pocket. *Please note that the Trek Accessories App currently only works with Trek CarBack Radar Rear Bike Lights. Learn more about Trek CarBack Radar Rear Bike light here - https://www.trekbikes.com/us/en_US/carback/ Find Trek Accessories App FAQs here - https://www.trekbikes.com/us/en_US/FAQ/trek-carback-radar-rear-bike-light/ Having trouble? Contact our support team for assistance at RiderSupport@Trekbikes.com ## Key features - Real-time vehicle detection - Audible and visual alerts - Distance and side-to-side positioning - Remote bike light control - Daytime running light activation - Adjustable alert settings ## Recent user reviews (10 of 11) All indexed reviews: https://appshunter.io/ios/app/trek-accessories/id6468969662/reviews.md ### 1/5 — Trek Carback *2026-06-19* Having trouble with connectivity. Disconnects while riding at times. **Developer response:** Thank you for your feedback! Please reach out to ridersupport@trekbikes.com and we'd be happy to help investigate and troubleshoot your disconnection issue with Trek Accessories and CarBack. Ride Bikes, Have Fun, Feel Good! ### 4/5 — Apple Watch Support *2026-05-19* Love the app but 2 request. Can you please add Apple Watch support to this app? I use Ride With GPS and I like to keep my iPhone on that app so it would be nice to see the CarBack info on my watch. Additionally, can you add support for Ride With GPS so I again I can see car data within the Ride With GPS app. ### 4/5 — Radar *2025-09-27, version 1.3.0* A veces no detecta coches cuando se vale en Grupetta o los detecta muy tarde. ### 5/5 — Funciona perfectamente *2025-05-19, version 1.2.0* Corregidos los problemas de desconexión. Una vez actualizada, no se desconecta y se puede usar a la perfección . Un 10 ### 1/5 — Decepcionado *2025-03-02, version 1.1.1* Tras la actualización del firmware el botón del Carback no cambia los modos de luz y la app no conecta con la luz. Se queda en bucle pasando por bluetooth las preferencias de la configuración sin conseguirlo. ### 1/5 — Don’t buy carback!!!Disconnection issues *2025-02-09* This device and app are useless. I have been using for 1 month. The app and device disconnect post-vehicle detection. It doesn’t always reconnect without intervention whilst riding. This is a major safety issue. I have done all of the recommended fixes and the issue persists. Returning device and buying a Garmin Varia 😡😡😡😡😡😡 **Developer response:** We're sorry to hear of your App-CarBack connectivity issues. Please reach out to us at ridersupport@trekbikes.com and we 'd be happy to provide additional troubleshooting support. Ride Bikes, Have Fun, Feel Good. ### 3/5 — Trek Carback Radar *2025-01-15* Needs improve display distance 150m is too short when riding in 50 km zone car alert and pass with in 3 seconds. If car is behind 300m riders can see on display and alert quick before car passing. Car passes so quick within 3 seconds when 150m . **Developer response:** Thank you for your feedback. CarBack can detect and display vehicles that are up to 240m away in the Trek Accessories App. Any vehicle identified at this range will display as an arrow under the 150m label; as the vehicle approaches, we provide more details about proximity relative to you. If you have any additional feedback or need additional support, please contact us at ridersupport@trekbikes.com. Ride Bikes, Have Fun, Feel Good! ### 3/5 — Decent but limited app *2024-11-26* This app connects easily to your CarBack radar, showing its power and battery status and letting you turn the audio on or off as desired. If you mount your iPhone on your handlebars, you get a nice live map showing detected cars relative to you. (It only supports portrait/vertical display, FYI.) But except for mute/unmute, there is no control over the sounds or their volume. That really matters if you don’t have the visuals from a bike computer or a handlebar-mounted iPhone. The alert tone is fairly audible when your phone is in a pocket or saddlebag, but the all-clear tone is not audible unless you are not moving— it takes very little road or wind noise to drown it out. The alert tone is more audible but can also get drowned out by strong road and wind noise. Control over alert volume and choices over the tones themselves are needed so you can get the best audio based on your ride conditions and your own hearing (what you can hear changes as you get older!). There is no Apple Watch support to make the radar status more accessible when you have no mounted phone or bike computer. Because the CarBack hangs on to the Bluetooth connection with your phone even after you turn it off with its physical button, you can get surprise alerts that the CarBack is no longer detected long after you turned it off. This seems to be antitheft feature, such as for when you park your bike for a break during a ride, but you can also get alerted at home when you are done with your ride and are no longer in range. This feature needs more thought. **Developer response:** Thank you for your feedback! The alerts use your device's system volume so you can change the volume of the "Car Detected" and "All-Clear" sounds by changing the current volume of your phone. When you are all done with your ride, we recommend turning off the CarBack light and fully closing the Trek Accessories App on your mobile device to eliminate the surprise alerts. If you have any additional feedback or need additional support, please contact us at ridersupport@trekbikes.com. Ride Bikes, Have Fun, Feel Good! ### 3/5 — Audio too limited when used without a computer *2024-10-25* I appreciate that the developers did not lard up this single-device controller app. But in a few key areas it needs more sophistication if you don’t have a handlebar-mounted computer or phone. If you rely on its audio because you keep your phone in your pocket, this app won’t work as well as it should. The detection ring is clear even with road noise and wind noise, so you’ll hear when cars are detected behind you. But the “all clear” soft doorbell chime is not audible while you are riding — and it’s only softly audible when you are not moving, such as when in a parking lot or picnic area. The developers should consider a “all clear” tone that cuts through ambient road and wind noise like the alert ring does. The iPhone volume control seems to have no effect on the app’s sound level. So, the ability to control the volume would also be helpful. I like the fact that there is a control in the app to turn the sound off and on, so you can silent alerts when stopped for a break or when in heavy traffic where the alerts stop being so useful because you know there are tons of cars behind you. Too bad that sound on/off is hidden in a drawer that has to first be opened by tapping the app screen — why add this step? I had a few reconnection issues when I moved far away from the CarBack, such as when getting lunch while the bike was parked outside. And there was no audio alert to let me know to check the app and perhaps reconnect. It didn’t happen consistently, though, so I don’t know if that’s an app issue or a Bluetooth hardware issue — just make sure the app is still connected when you pedal off, so you know you’ll actually get the notifications. Again, it seems the developers could be a bit more aware of how the app functions in a screen less usage scenario (I.e., when the phone your pocket or bike bag). Setup is super easy, and the screen seems well designed the few times I pulled out my phone when riding to check it out. Better care around audio-only usage would make this app a strong winner. ### 5/5 — Great app and device *2024-07-20* App works perfectly, pairs up instantly with the radar/ light, helps keep me safe on the road. Highly recommend. **Developer response:** Thank you for your feedback! We are always open to improving our fun products with new and helpful features. If you need additional support contact us at ridersupport@trekbikes.com. Ride Bikes, Have Fun, Feel Good! ## Frequently asked questions about Trek Accessories ### What does the Trek Accessories App do? The Trek Accessories App enhances the functionality of the Trek CarBack Radar Rear Bike Light. It provides cyclists with advanced alerts and a real-time visual depiction of detected rear-approaching vehicles, helping them stay aware of traffic. ### How does the app detect vehicles? The app, when paired with the Trek CarBack Radar, can detect rear-approaching vehicles from up to 240 meters away. It provides audible beeps and visual indicators as vehicles get closer, showing their distance and position relative to the cyclist. ### Can I control my bike light with this app? Yes, the Trek Accessories App allows you to turn on and off a connected Trek CarBack Rear bike light directly from the app screen. This includes activating its Daytime Running Light Performance for increased visibility. ### Is this app compatible with any bike radar? No, the Trek Accessories App currently only works with Trek CarBack Radar Rear Bike Lights. It is designed to integrate specifically with this hardware. ### What are the benefits of using this app while cycling? The app significantly improves cycling safety by alerting you to approaching vehicles, allowing you to prepare for passes. It also helps cars see you by enabling remote control of your bike's bright daytime running light. ## Version history (last 5 releases) ### 1.5.0 — 2026-02-04 * Enable Notifications - Allow real-time battery, light, and connection alerts to your mobile device. * Misc bug fixes and enhancements. ### 1.4.0 — 2025-11-20 Adjust audio settings - Customize audio output on your phone. Dynamic Light Mode - Automatically switch to flash pattern when a vehicle is detected. Requires Trek Accessories app. Auto-dim screen - Automatically dim your phone's screen when no vehicles are detected. Misc bug fixes and enhancements. ### 1.3.0 — 2025-08-27 * Misc bug fixes and enhancements ### 1.2.0 — 2025-04-08 * New Feature - Firmware Updates. Update your CarBack device with the latest and greatest firmware for the best experience possible. * Misc bug fixes and enhancements ### 1.1.1 — 2025-01-24 * New Feature - Firmware Updates. Update your CarBack device with the latest and greatest firmware for the best experience possible. * Misc bug fixes and enhancements ## Apps similar to Trek Accessories | App | Rating | Price | Category | | --- | --- | --- | --- | | [CycliqPlus](https://appshunter.io/ios/app/cycliqplus/id1156343649) | 4.0 (392) | Free | Sports | | [MyCampy](https://appshunter.io/ios/app/mycampy/id6449250630) | 2.3 (13) | Free | Sports | | [TQ E-Bike](https://appshunter.io/ios/app/tq-e-bike/id1597303825) | 2.8 (13) | Free | Sports | | [CeramicSpeed Bike App](https://appshunter.io/ios/app/ceramicspeed-bike-app/id1635549762) | 3.0 (6) | Free | Sports | | [Intuvia 100 Update](https://appshunter.io/ios/app/intuvia-100-update/id6474067957) | 1.8 (5) | Free | Sports | | [FAZUA](https://appshunter.io/ios/app/fazua/id1503024802) | 4.3 (230) | Free | Sports | ## More apps by Trek Bicycle - [Trek Central](https://appshunter.io/ios/app/trek-central/id1609966547) - [Trek Ride Club](https://appshunter.io/ios/app/trek-ride-club/id6741499740) All apps by Trek Bicycle: https://appshunter.io/developer/780864901 ## Related topics [trek accessories](https://appshunter.io/ios/topics/trek-accessories) · [trek bicycle](https://appshunter.io/ios/topics/trek-bicycle) · [trek](https://appshunter.io/ios/topics/trek) · [trek bike](https://appshunter.io/ios/topics/trek-bike) · [trek central app](https://appshunter.io/ios/topics/trek-central-app) · [trek flow](https://appshunter.io/ios/topics/trek-flow) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*