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Head-to-head · Best Bike Lights

Garmin Varia RTL515 vs Knog Blinder Link

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Garmin Varia RTL515 comes out ahead by a narrow margin (4.3 vs 4.2). Garmin Varia RTL515 is best for: Road riders who want a rear light that also warns of overtaking traffic on a paired head unit, watch or phone. Read the strengths below before deciding.

Garmin Varia RTL515
Higher ratedRanked #1 in Best Bike Lights
Garmin Varia RTL515
2 sources$199.99as of Oct 11

The Garmin Varia RTL515 combines a rear light with a radar that warns of traffic approaching from behind. Road.cc found the radar alert reliable and the light very good, and Cycling Weekly came away impressed by how early it flags vehicles. Garmin quotes a detection distance of 140 metres, and the light changes its flash pattern when something approaches. Both outlets call it expensive, Cycling Weekly notes it gives only one alert for vehicles in convoy and does not spot every approaching vehicle, and road.cc points out that it charges over Micro USB.

Strengths
  • — Radar alerts the rider to overtaking traffic before it can be seen or heard, per road.cc
  • — Day flash is rated at 65 lumens with a claimed 16 hours, which road.cc found about right
  • — Light changes its flash pattern when a vehicle approaches
Watch-outs
  • — Expensive, according to both road.cc and Cycling Weekly
  • — Cycling Weekly: only one alert for vehicles in convoy, and it does not spot all approaching vehicles
  • — Charges via Micro USB rather than USB-C
$199.99 · Buy at garmin.comFull review →
Knog Blinder Link
Ranked #4 in Best Bike Lights
Knog Blinder Link
1 source$64.99as of Oct 11

The Knog Blinder Link addresses urban visibility challenges by offering dedicated saddle and rack mounts that keep lights exposed above panniers or cargo, a feature Bikerumor highlights as essential for modern commuters. The unit weighs 74g to 77g depending on the version and utilizes a quick-clip system for easy removal during charging, while Electricbikejournal confirms its IP67 waterproofing withstands heavy rain. However, the maximum brightness of 100 lumens is modest, and battery life drops significantly on higher output modes, lasting only four hours in continuous beam or seven hours on high flash. This light fits riders prioritizing versatile mounting and all-day eco-mode endurance over raw brightness, while those needing intense illumination for dark trails should look elsewhere.

Strengths
  • — Offers versatile mounting options including dedicated saddle and rack mounts to ensure visibility even when cargo covers standard positions.
  • — Features a quick clip-on/off attachment system that allows for easy removal from the bike for charging without removing the mount.
  • — Provides eight different flashing modes designed to maximize rider visibility to traffic.
Watch-outs
  • — Battery life drops significantly on higher output modes, lasting only four hours in continuous beam and seven hours on high flash.
$64.99 · Buy at us.knog.comFull review →

How they stack up

Garmin Varia RTL515

The Garmin Varia RTL515 peaks at 65 lumens in day flash, below the Knog Blinder Link's 100-lumen maximum, but adds radar alerts the Knog does not have. It charges over Micro USB, while the Knog Blinder Link uses USB-C.

Knog Blinder Link

The Knog Blinder Link is a rear light with a 100-lumen maximum, while the NiteRider Swift 500 is a 500-lumen front light. The Blinder Link carries an IP67 rating against the Swift 500's IP64.

Specs side-by-side

SpecGarmin Varia RTL515Knog Blinder Link
Lumens65 (day flash)100
Light Modes4: solid 20 lumens, peloton 8 lumens, night flash 29 lumens, day flash 65 lumens8 programmable
Battery Life6 hours solid, 8 hours peloton, 6 hours night flash, 16 hours day flash (claimed)Up to 50 hr runtime
Radar Range140 metres (claimed)—
ConnectivityANT+, Bluetooth—
Charging InterfaceMicro USBUSB-C
Mounting TypeSeatpost, quarter-turn mountSaddle, Rack
Water Resistance—IP67
Weight—2.72 oz
Dimensions—H: 51mm x W: 44mm x L: 77mm
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