Garmin Varia RearVue 820

The Garmin Varia RearVue 820 is Garmin's latest flagship rearview radar tail light (launched early 2026), combining advanced bike radar detection with a high-visibility tail light—designed for road, gravel, and commuting cyclists who prioritize awareness, safety, and being seen from behind.

This compact unit features Garmin's most powerful radar yet, detecting vehicles up to 175 meters (191 yards) away with a wider field of view, tracking vehicle size (e.g., car vs. truck), side-to-side movement, and categorizing threat levels (low/medium/high) for more intelligent alerts. It maintains tracking even when vehicles match your speed (no "disappearing" issues). Alerts display on compatible Garmin Edge cycling computers, select Garmin smartwatches, or the Varia app on your phone, with visual and audible warnings. The integrated tail light is Garmin's brightest ever (up to ~100 lumens in day flash, visible over 2 km/1.24 miles), with modes including solid, peloton (reduced brightness for group rides), night flash, day flash, custom patterns via app, and an automatic brake light that flashes uniquely when you slow or stop. Battery life excels at up to 24 hours in day flash mode, 30 hours in radar-only, with USB-C charging and a sleek, weather-resistant design plus a secure quarter-turn seatpost mount for easy install on most bikes.

A premium upgrade over predecessors like the RTL-515, offering superior detection range, smarter tracking, longer runtime, and added safety features—ideal for serious riders in traffic-heavy or high-speed scenarios, though some advanced visuals (e.g., threat icons) work best with newer Garmin devices.