Verified purchaser
Product Details
Garmin Varia RearVue 820 Radar Light
At the heart of the Varia RearVue 820 is Garmin’s most advanced cycling radar to date. It detects vehicles approaching from up to 175 metres behind, using a wider field of view for more reliable, earlier alerts. Whether you’re riding country lanes, busy commuter routes or fast descents, you’ll know what’s coming — sooner and with greater accuracy.
Bright Rear Light with Intelligent Brake Light
Visibility saves lives, and the RearVue 820 delivers Garmin’s brightest rear light yet, visible from up to 2 km (1.24 miles) away. The built-in brake light automatically detects when you’re slowing or stopping and displays a distinctive flash pattern, helping drivers and riders behind you react faster.
Advanced Vehicle Tracking and Threat Alerts
When paired with a compatible Garmin Edge® bike computer or the Varia™ smartphone app, the RearVue 820 doesn’t just alert you to cars - it gives context. See whether approaching vehicles are small, medium or large, track lane changes, and understand threat levels based on speed, size and position. It’s next-level situational awareness for serious cyclists.
Alerts Your Way – Visual, Audible and Haptic
Stay informed without distraction. The Varia RearVue 820 connects seamlessly to the Varia app, Edge bike computers and Garmin smartwatches, giving you visual, audible and haptic alerts while you ride. Selected Garmin smartwatches can even provide voice alerts for approaching vehicles (available via the Garmin Public Beta programme), so you can keep your eyes on the road.
Multiple Light Modes for Every Ride
Adapt your visibility to the conditions with four light modes:
- Day flash
- Night flash
- Solid
- Peloton mode (designed to be easier on the eyes of riders behind you)
You can also create custom light patterns in the Varia app, tailoring brightness and behaviour to your riding style.
Compact, Clean and Easy to Fit
With its sleek, compact design and new seatpost mount, the Garmin Varia RearVue 820 fits neatly onto almost any road or gravel bike. It’s also compatible with the Varia seat rail mount kit (sold separately), keeping your setup clean, secure and aerodynamic.
Technical Specifications:
- Dimensions: 98.9 × 25.9 × 43.2 mm (3.9″ × 1″ × 1.7″)
- Weight: 90 g (3.2 oz)
- Custom light mode configuration: Yes (with Varia Mobile App)
- Lumens: 25 (solid), 8 (peloton), 40 (night flash), 100 (day flash)
- Water rating: IPX7
- 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 - Brake light - Rear radar
- Lateral vehicle positioning
- Vehicle size classification
- Vehicle threat classification: Speed-, size-, and lateral-range-based
- Maximum vehicle detection range: 175 m
- Radar beam width: 60°
- Connectivity - via Varia™ app compatibility
In the Box:
- Varia™ RearVue 820 radar tail light
- Mounting kit
- Charging cable
- Documentation
Features
- Tracks vehicles up to 175 metres away with a wider field of view
- Get up to 24 hours of battery life in day flash mode
- Bright tail light is visible up to 2 km (1.24 miles) away
- See the size of approaching vehicles (When riding with your compatible Edge® cycling computer or the Varia™ app on your smartphone)
- Brake light alerts others that you’re slowing or stopping.
- Stay alert to vehicles travelling at the same speed (Same-speed tracking is limited or may be unavailable at slower speeds or when radar cannot detect the road (e.g., due to snow, ice, heavy rain, or other obstructions or incorrect device mounting)
Specifications
- Compatibility (Device / Platform)
- ANT+, Bluetooth, iOS, Android
- Connectivity Type
- ANT+, Bluetooth
- Power Source Type
- Rechargeable Battery
- Primary Product Type (Electronics)
- Smart Rear Radar Light
- Water Resistance Rating
- IPX7
- Battery Life (Typical Use, Hours)
- 24 hrs
- Charging Interface
- USB-C
- Dimensions (L x W x H mm)
- 98.9 x 25.9 x 43.2
- Display Type
- No Display
- Firmware Upgradable
- Yes
- Mounting Location
- Seatpost
- Release Year
- 2025
- Weight (g)
- 90 g
Reviews
4.5
Value of Product
Quality of Product
Verified purchaser
Shipping & Returns
Free UK delivery on orders over £50. Orders are dispatched within 1-2 working days and typically arrive 1-2 working days later.
Return unused items in their original packaging within 30 days of delivery. Return postage is £3.50.
Q & A
2 questions answered
Hi does the 820 pair with 1030 edge
Hi there, Yes it does, Many thanks Joe W
Has Garmin finally switched to a USB C charging port for this ?
Hi there, Yes they have, Many thanks Joe W
Yes
About Garmin
Data, in the hands of the riders who act on it.
Garmin has been navigating riders, runners and explorers since 1989. From the original GPS unit to today's Edge cycling computers and Forerunner watches, every product is built to put rich, accurate data into the hands of the people who'll act on it.
The Edge range is the most widely used cycling computer line in the world. Mapping, power, training load, structured workouts, group ride messaging, incident detection — Edge has set the bar most other head units now chase.
