Bryton Gardia R300: Radar + Light with Garmin Compatibility

The Bryton Gardia R300 is Bryton鈥檚 first rear radar, released in 2025 and refreshed in 2026. After four weeks of testing, it is a credible mid-range option with excellent Garmin compatibility and long battery life.

Bryton has been making bike computers since 2012, but the Gardia R300 is their first radar-equipped product. The company leveraged its experience with ANT+ connectivity to build a radar that integrates seamlessly with Garmin Edge head units.

Key Specifications

• Radar detection up to 110 m
• NO video recording
• Light modes: Solid, Peloton, Night Flash, Day Flash
• Battery: up to 16h day flash
• 92 g weight
• IPX7 water resistance
• ANT+, Bluetooth LE
• Bryton Active app (iOS/Android)
• $249 USD MSRP

Build & Design

The Gardia R300 is compact and lightweight. The unit mounts to a standard seatpost using a quarter-turn adapter and includes hardware for round and aero seatposts.

The radar sensor and light sit on the back of the unit, with a small status LED on the side. The unit pairs with Garmin Edge units, Bryton head units, Wahoo head units, and third-party apps via ANT+ and Bluetooth.

Real-world Testing

Four weeks of daily commuting (about 600 km total) gave a clear picture. Radar detection is good 鈥?the unit picked up vehicles at 100-110 m on flat roads, comparable to the Wahoo TRACKR (110-120 m) and better than the Magene L508 (90-100 m).

The light is bright. The Day Flash mode is visible at 400+ m in daylight, comparable to the Wahoo TRACKR (400+ m). The Night Flash mode is visible at 800+ m in low-light conditions.

Battery life is good. In day-flash mode, the unit lasted 14-16 hours on a charge, matching the claimed spec. This is between the Wahoo TRACKR (18-20h) and the Magene L508 (10-12h).

Garmin compatibility is excellent. The unit paired with a Garmin Edge 1040 Solar on the first try and displayed radar data correctly. Bryton Active app is functional but rougher than the Wahoo or Garmin apps.

Pros

• Excellent Garmin compatibility
• Good radar detection (110 m)
• Long battery life (16h day flash)
• IPX7 water resistance
• ANT+ / Bluetooth connectivity
• No subscription required

Cons

• NO video recording
• $249 MSRP is the same as the Wahoo TRACKR
• Bryton Active app is rougher than Wahoo or Garmin
• No WiFi (firmware updates via Bluetooth)
• Smaller ecosystem than Wahoo or Garmin

Verdict

The Bryton Gardia R300 is a solid mid-range rear radar with excellent Garmin compatibility. It is the right choice for Garmin users who want a radar that integrates seamlessly with their Edge head unit. Riders who want longer battery life should consider the Wahoo TRACKR Radar. Riders on a tighter budget should consider the Magene L508 ($179). For Garmin users specifically, the Gardia R300 is an excellent choice.