Garmin Varia RearVue 820 Radar Tail Light

Varia RearVue 820

The Varia RearVue 820 features our most powerful and precise bike radar yet, with a wider field of view for more reliable alerts. The tail light offers visibility up to 2 km (1.24 miles) and includes a brake light that activates when you are slowing or stopping.

Powerful and Reliable Radar
This radar detects vehicles approaching from up to 175 metres away with a wider field of view, helping you stay aware of traffic around you.

Bright Tail Light and Brake Light
The brightest tail light in the Varia range keeps you visible from up to 2 km (1.24 miles) away. The brake light detects when you are slowing or stopping and displays a unique flash pattern for increased safety.

Advanced Vehicle Tracking
See alerts for small, medium, and large vehicles, track lane changes, and view threat levels when using a compatible Edge® bike computer or the Varia app on your smartphone.

Custom Alerts
Receive visual and audible alerts by connecting the radar to the Varia smartphone app, compatible Edge bike computers, or Garmin smartwatches. Selected Garmin smartwatches also provide voice alerts for approaching vehicles via the Garmin Public Beta programme.

Variety of Light Patterns
Choose from four light patterns: day flash, night flash, solid mode, and peloton mode, which helps preserve the vision of riders behind you. Custom light patterns can be created in the Varia app.

Compact Design
A sleek, compact design and updated seatpost mount allow the Varia RearVue 820 to fit cleanly on almost any road or gravel bike. It is also compatible with the Varia seat rail mount kit (sold separately).

Notes:
1 When riding with a compatible Edge® cycling computer or the Varia app.
2 Same-speed tracking may be limited at slower speeds or when the radar cannot detect the road (snow, ice, heavy rain, obstructions, or incorrect mounting).
3 Voice alert feature is in public beta testing and may be enhanced in the future.

Specification

Dimension 98.9 x 25.9 x 43.2 mm (3.9" x 1" x 1.7") Weight 90 g (3.2 oz) Light modes Solid, peloton, night flash, day flash Custom light mode configuration Yes (with Varia Mobile App) Radar-only mode Yes Lumens 25 solid, 8 peloton, 40 night flash, 100 day flash Water rating IPX7 Yes Battery life: 10 hours solid 15 hours peloton 10 hours night flash 24 hours day flash 30 hours radar-only ANT+® Yes (radar, bike lights) BLE Yes (radar, bike lights) Viewing angle 220° Visibility distance 2 km Rear tail light Yes Brake light Yes Rear radar Yes Lateral vehicle positioning Yes Vehicle size classification Yes Vehicle threat classification Speed-, size- and lateral range-based Maximum vehicle detection range 175 m Radar beam width 60° Varia app compatibility Yes Security updates until at least (YYYY-MM-DD) 2028-02-03