Garmin Varia RearVue 820 Radar Taillight — Frequently Asked Questions

Everything you need to know about the Garmin Varia RearVue 820, the latest rearview radar taillight from Garmin, available in Singapore from Bikers.SG with local stock and warranty support.

What is the Garmin Varia RearVue 820?

The Garmin Varia RearVue 820 is a rear-facing cycling radar and taillight that detects motor vehicles approaching from behind at up to 140 metres and alerts you via a compatible Garmin head unit or the Varia smartphone app. It is the successor to the Varia RTL515, offering improved radar performance, a brighter taillight, and longer battery life.

What are the key features of the Garmin Varia RearVue 820?

• Radar detection of approaching vehicles up to 140 metres away
• Taillight with up to 82 lumens — visible up to 1 kilometre in daylight
• Multiple light modes: solid, flash, peloton, and night flash
• ANT+ and Bluetooth connectivity to compatible Garmin head units and smartphones
• Compatible with Garmin Edge 550, Edge 850, Edge 1050, and other Garmin devices
• Varia app for iOS and Android for standalone smartphone use
• Up to 16 hours battery life in radar + flash mode
• IPX7 waterproof rating
• Lightweight at approximately 54 grams

How does the Garmin Varia RearVue 820 radar work?

The RearVue 820 uses radar to detect motor vehicles approaching from behind at distances of up to 140 metres. When a vehicle is detected, a visual alert appears on your paired Garmin head unit or Varia app. The alert updates in real time as the vehicle approaches and passes, giving you advance warning to prepare for the overtake.

What head units is the Garmin Varia RearVue 820 compatible with?

The RearVue 820 is compatible with Garmin Edge cycling computers that support Varia radar, including the Edge 550, Edge 850, and Edge 1050. It also works with the Varia app on iOS and Android smartphones. Check Garmin’s official compatibility list for the full range of supported devices.

What is the battery life of the Garmin Varia RearVue 820?

Battery life depends on the mode used:

• Radar + flash mode: up to 16 hours
• Radar + solid mode: up to 6 hours
• Taillight flash only (no radar): up to 24 hours

Battery life varies with light mode settings and environmental conditions.

Is the Garmin Varia RearVue 820 waterproof?

Yes. The RearVue 820 is rated IPX7, meaning it is protected against immersion in water up to 1 metre for up to 30 minutes. It is fully suitable for riding in rain and wet conditions.

How do I mount the Garmin Varia RearVue 820?

The RearVue 820 mounts to your seatpost using the included mount. It supports standard round seatposts. For bikes where seatpost mounting is not possible, Garmin offers a seat rail mount kit (sold separately, also available from Bikers.SG). The device must face directly rearward for optimal radar performance.

Can I use the Garmin Varia RearVue 820 without a Garmin head unit?

Yes. The Varia app (free on iOS and Android) allows you to use the RearVue 820 paired to your smartphone. The app displays radar alerts on your phone screen during rides.

How do I pair the Garmin Varia RearVue 820 to my Garmin Edge?

1. Power on the RearVue 820 by pressing and holding the power button.
2. On your Garmin Edge, go to Settings > Sensors > Add Sensor.
3. Select Lights or Radar from the sensor type list.
4. The Edge will scan and detect the RearVue 820 — select it to pair.
5. Once paired, radar alerts will appear on your Edge screen during rides.

What is the difference between the Garmin Varia RearVue 820 and the Varia RCT715?

The RearVue 820 is a radar and taillight only — it does not record video. The RCT715 adds an integrated 1080p rear-facing camera for incident recording. The RearVue 820 is lighter, has longer battery life, and is the better choice if video recording is not required. The RCT715 is recommended if you want footage of your rides for safety evidence.

Does the Garmin Varia RearVue 820 replace the Varia RTL515?

Yes. The RearVue 820 is the successor to the Varia RTL515, offering a brighter taillight (82 lumens vs 65 lumens), improved radar performance, and longer battery life. Bikers.SG stocks the RearVue 820 as the current model.

Is the Garmin Varia RearVue 820 available in Singapore?

Yes. The Garmin Varia RearVue 820 is available from Bikers.SG with Singapore-ready local stock. We offer island-wide delivery and local pickup. All units sold by Bikers.SG come with Singapore warranty support.

What warranty does the Garmin Varia RearVue 820 come with when purchased from Bikers.SG?

The Garmin Varia RearVue 820 purchased from Bikers.SG comes with the standard Garmin manufacturer warranty. For warranty claims and after-sales support, contact us directly at Bikers.SG and we will assist you with the process.

Who should I contact for support after purchasing from Bikers.SG?

For any product questions, setup assistance, or after-sales support, contact us via the Bikers.SG contact page. We are based in Singapore and provide local support for all products we sell.