Garmin Varia RTL515 Radar Tail Light: 140 m Vehicle Alerts, 16 Hours (£170)
The Garmin Varia RTL515 is a rear light with a built-in radar that warns of vehicles approaching from behind. We have not tested it. This page collects what Tredz lists and the current price.
Available now: Garmin Varia RTL515 Rearview Radar — £169.99 at Tredz, correct at time of writing, 25 October 2026.
What the retailer lists
- Radar range: detects vehicles approaching from up to 140 metres behind.
- Pairing: works with Edge bike computers, compatible smartphones and select Garmin wearables.
- Light: daylight visibility up to 1 mile, with a peloton mode that flashes at low intensity for group rides.
- Battery: up to 16 hours in day flash mode and up to 6 hours in solid mode.
- Mounting: a compact vertical design that fits the seatpost of most road bikes.
- Apps: the Varia app shows approaching cars, and the radar works with third-party apps such as Ride with GPS.
Where it fits for triathletes
The points below are our reading of the listed features, not test results.
- Dark winter mornings. Early training rides on shared roads are where a radar warning matters most. We have not tested the detection.
- Needs a screen. The alerts show on a paired Edge, watch or phone, so check yours is compatible.
Where to buy
Tredz lists the Garmin Varia RTL515 Rearview Radar at £169.99 at time of writing, and the link below goes to the same product page.
Related guides
See also our best bike lights for early-morning training, the Lezyne Radar React review and the Garmin Varia Vue review.
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