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GarminVaria RTL510 Radar Tail Light

Temporarily Out Of Stock

Item # GRM009F

Don't get too bummed. This item is on the way and will be available for purchase as soon as it rolls into the warehouse.

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Visualize traffic without taking eyes off the road.

There's nothing that's going to magically make all the vehicles on the road disappear, but at least you'll be able to visualize how fast they're approaching while simultaneously alerting them of your existence with the Garmin Varia RTL510 Radar Tail Light. This seatpost-mounted tail light is equipped with a radar unit that detects traffic from up to 153 yards behind you, so you'll never have to look over your shoulder, only to swerve to the side of the road as a vehicle speeds past you with reckless abandon.

This tail light delivers 220-degrees of red illumination that's seen up to a mile away by rearward traffic, so you'll easily be spotted by traffic, regardless if you're riding in the city or countryside. It pairs with Garmin's separately available head units, watches, and eyeglass attachments to provide a visual indicator of just how close and fast rearward traffic is approaching. Among these compatible devices are the ever-popular Edge series of head units, Phoenix series of watches, and Varia Vision In-sight Display that neatly attaches to your glasses.

  • Radar-equipped tail light spots traffic as it approaches
  • This version is Varia RTL510 light only (no radar display)
  • Pairs with Garmin devices to give visual traffic indicators
  • Provides 220-degrees of red illumination to rearward traffic
  • Solid, Night Flash, and Day Flash provide light customization
  • Lasts up to 6 hrs in Solid/Night Flash and 65 hrs in Day Flash
  • Includes seatpost mounting kit and charging cables

California Proposition 65


Cancer and Reproductive Harm -

Tech Specs
ModesSolid, Night Flash, Day Flash
Lumens[Solid] 20, [Night Flash] 29, [Day Flash] 65
Distanceradar alerts you of vehicles approaching up to 153 yards away, tail light is visible up to a mile away
Burn Time[Solid] 6 hours, [Night Flash] 6 hours, [Day Flash] 65 hours
Mountseatpost mounting kit
WaterproofIPX-7 rating (submerged one meter for 30 minutes)
IncludesVaria RTL510, mounting kit, cables
Dimensions3.9 x 0.8 x 1.6 in
Recommended Usecommuting, road cycling
Manufacturer Warranty1 year

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

71 g

Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

What do you think about this product?



This will work on any of my wahoo devices correct ?

>Rating: 5

Like eyes in the back of your head

I've put it through the wringer

You know the situation in front of you, this lets you know what is going on behind. I was very surprised at how useful it is to know what (if anything) is coming from behind. Can you safely pass the slow rider in front of you? Can I swerve into the lane to avoid rocks in the shoulder. Should I get over to the right ASAP or move left to block the car from passing? Can I safely descend in the middle of the lane? All this becomes clear to you with the radar tail light. I feel like I now have a 360 degree view of the situation I am riding in. Highly recommended.

>Rating: 5

Anti-Anxiety/Radar Device

I've used it several times

Works wonderfully with my Garmin Edge. There's no perfect solution other than having eyes on the back of your head, but this is the next best thing. No false readings. Although it does occasionally register a rider behind me. But not always.

>Rating: 5

A must have

I've used it once or twice and have initial impressions

After one ride, I don’t ever want to ride without this. I have it paired with a Wahoo Bolt and it works great. The odd false report from other riders but I don’t find that annoying. More importantly, it never failed to register a car or motorcycle. The audible alerts signaling approaching vehicles and all clear works surprisingly well, even with headphones playing low volume music. It is a bit heavy but it’s a trade off I would make any day.

>Rating: 5

Car Back!!

I've put it through the wringer

The radar is accurate, and the light is bright. It's bulky in my opinion, but I'm used to my smaller Cygolite TL50. I chose to mount mine upside down, and tucked into my saddle rails. Function had not been affected. It integrates well with my 520 plus. For the price, a better mount should come with it. However, I've never had a Garmin strap break and I doubled up using some extras I have. It can get wonky in a large bunch, if you're mid-pack. It will confuse larger, fast riders with cars. Solo riding, it's flawless.

>Rating: 5

Improves safety more than I expected

I've put it through the wringer

The Varia is useful in ways I didn’t anticipate: - You can tell where along the road a car will pass you. If it will be near a blind corner, crest, or oncoming traffic, you can expect to get squeezed. If they do the right thing and hang back, you can see that. - If you need to turn left off a busy 2-lane road, you know if traffic is coming behind you (I still shoulder-check to confirm!). - If there is a broken-up section of pavement ahead, you know if it’s safe to move towards smoother pavement in the middle of the lane. - Relying on your ears to detect traffic coming up from astern can be tricky because sounds bounce off surrounding terrain. A car approaching from behind can sound like traffic from ahead. Or traffic sounds from a parallel highway/interstate can confuse you. The Varia sorts that out. - If you’re on a back road with very little traffic and start daydreaming, the alert sound brings you back. Modern cars can be very quiet and sneak up on you. - Don’t need to do as many shoulder-checks, it picks up traffic well, so far no false positives or negatives. It doesn’t cover ALL safety issues: - Not useful in heavy traffic because it alerts constantly. - Can’t tell how close passing traffic will come to you laterally. - When a car is closely following another car, the Varia can’t “see” the second car. - On a twisty road, terrain may block the beam, so a dot may disappear temporarily. For the alert sound, you have a choice of a beep or a trill. I use the trill: it’s unlike any of the Garmin’s other sounds, so I don’t have to keep looking at the screen. Rather than Garmin’s included seat post mount, I use a 3D printed clip sold on Amazon: That enables you to put it on the tail light loop on the back of a seat bag (e.g. Topeak Aero Wedge), where it will be higher = more visible and perhaps increase the radar’s range.

>Rating: 5

Definitely a Big-Time Safety Assist!

I gave it as a gift but have feedback to share

The Varia RTL510 is a great addition to the arsenal of safety features for vulnerable cyclists! I bought one for my wife, who was initially somewhat dubious. It was easy to set up, easy to use, and she loves it! The device unfailingly picked up vehicles as they approached from behind while we were out riding on a busy county road.

>Rating: 5

Less Looking Over Your Shoulder

I've put it through the wringer

I've had this product for a while now. It is very effective out on the road. You can ride out in the smoother part of the lane and get audible warnings of approaching vehicles on your Garmin Edge, as will as depiction of the vehicle(s) on the screen in red, and a green all clear when they have all passed. The flash rate also increases to help catch the driver's attention when the radar senses them. Very few false alerts. Nice, bright, and rechargeable. Solid construction as with most Garmin devices. Much more effective than the previous version. You need all the protection you can get when road cycling with all of the distracted drivers out there.


Will this work with an older Garmin 510?

The Edge 510 is on the list of compatible devices under Varia on the website.


Does this sync and work with a Garmin 520?

Hi Paul, the Varia RTL510 will indeed work with the Edge 520.