Garmin eRTL615: A Radar Safety System for e-bike Cyclists

Radar-enhanced tail light protection

Imagine exploring the open road on your two-wheeled companion, with the wind against your face and the sun at your back. As you travel, there's an unseen guardian providing you with an extra layer of safety, like a watchful hawk soaring above. That guardian is the Garmin Varia eRTL615 radar/tail light module.

Retrofitting your ebike with this remarkable device is like having an extra pair of eyes constantly scanning the road behind you. It's a beautiful melding of technology and practicality, keeping you informed about your surroundings while you focus on the journey ahead.

The eRTL615's radar capabilities are impressive, detecting vehicles up to 150 yards away and conveying that information to your Garmin smartwatch, Edge cycling computer, or smartphone. It's like having a telepathic bond with the road, allowing you to anticipate and respond to approaching traffic with grace and confidence.

But it doesn't stop there. The tail light component of the device is a powerhouse in its own right, offering four output modes and a maximum brightness of 65 lumens. It's like a tiny lighthouse guiding vehicles and ensuring they're aware of your presence, especially as the light flashes more rapidly when they approach.

The eRTL615 boasts an appealing blend of features and durability, weighing a mere 1.8 oz and flaunting IPX7 water resistance. This gadget is more than just a pretty face – it's a rugged companion, built to keep up with your adventures.

At $299.99, the Garmin Varia eRTL615 may seem like a luxury, but it's an investment in your safety and peace of mind. Whether you're a seasoned cyclist or a weekend warrior, this device is a valuable ally on the road, empowering you to explore new horizons with confidence.

After all, it's not just about the destination, but the journey itself – and the eRTL615 ensures that your journey is a safer and more enjoyable one. So, take to the open road, embrace the unknown, and let this little guardian be your guide.


  1. Enhanced Safety: The radar system detects vehicles approaching from behind, providing the cyclist with an extra layer of protection and awareness on the road.
  2. Seamless Integration: The eRTL615 connects wirelessly to Garmin smartwatches, Edge cycling computers, or smartphones, allowing for easy access to real-time information.
  3. Tail Light Functionality: The tail light offers four output modes and a maximum brightness of 65 lumens, increasing visibility and alerting drivers of the cyclist's presence.
  4. Versatility: The device is compatible with both ebikes and non-electric bikes, with the latter having the option of a battery-powered version.
  5. Durable and Lightweight: Weighing only 1.8 oz and sporting an IPX7 water resistance rating, the eRTL615 is built to withstand the rigors of cycling adventures.
  6. Multiple Communication Protocols: The device supports both ANT+ and Bluetooth Low Energy wireless protocols, providing flexibility in connecting with various devices.


  1. Price: At $299.99, the Garmin Varia eRTL615 may be considered a pricey investment for some, particularly for casual or infrequent cyclists.
  2. Potential Overreliance: While the radar system offers valuable information, cyclists should not rely solely on it and must continue to practice proper road safety and situational awareness.
  3. Installation: The eRTL615 needs to be mounted and wired into the ebike's electrical system, which may be a challenge for those who are less tech-savvy or inexperienced in bike modifications.
  4. Limited Detection Range: The radar's 150-yard detection range, while substantial, may still leave some room for improvement, especially in high-speed traffic situations.
  5. Device Compatibility: The eRTL615 works optimally with other Garmin devices or smartphones, potentially limiting its appeal for those who use different brands or prefer a more standalone solution.
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