Best bike rear lights 2023 to keep you safe on the roads

The best bike rear lights to prevent rear-end shunt unpleasantness

Best bike rear light: Pictured here, a long exposure shot of a bike rear light in a mountainous area
(Image credit: Cat-eye)

Why do you need the best bike rear light? Having the red blinker do its magic at your bike's rear can add an extra layer of security to your rides, no matter the light conditions. Drivers are often sleepy, and visibility is often poor in the mornings/early evenings, so adding a rear bike light to your bicycle before you kick off from the curb is highly recommended.

We've already brought you our pick of the best bike front lights for cycling; now it's time to look backwards. These red-hued blinkers will light up your backside like a Christmas tree when darkness falls. On the contrary, turning the little red LED blinkers on the back of the bike during daylight is incredibly beneficial. According to research (external link), "it is clear that the majority of casualties occur during daylight, but there is still a significant minority that occurs after dark". 

So whilst you'd think you are visible enough on the bike in broad daylight, in fact, you are in more danger, so having an inexpensive gadget blinking away behind you as your ride is strongly recommended, regardless of the light conditions. It's also worth noting that while many of the best electric bikes have built-in lights, a second one is still a worthy investment. Not to mention if you happen to have a road bike.

Best bike rear lights to buy right now

Why you can trust T3 Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.

Bontrager Flare RT on white backgroundT3 Best Buy Award badge

1. Bontrager Flare RT

Best bike rear light

Specifications

Maximum lumens: 90
Battery life: Up to 15 hours
Rechargeable: Yes

Reasons to buy

+
Compact design 
+
Visible up to 2km away 
+
Smart connectivity

Reasons to avoid

-
25 lumens on steady mode is on the low side

The Bontrager Flare RT was already one of our favourite lights but this all-new version steps things up a notch. It’s 30 per cent more powerful, with the maximum output now amped up to 90 lumens, and 36 per cent smaller, so while the light may pack a mean punch, it takes up barely any space on your bike.

Bontrager was among the first brands to pioneer daytime bike lights and the Flare RT has a specifically designed focus and flash pattern for daytime use. That, combined with the raw power of the light, apparently means it’s visible up to 2km away on the most powerful setting. Otherwise, you also have 45-lumen and five-lumen flash modes to choose from, as well as 25-lumen and five-lumen steady-state options.

The Flare RT may have one simple goal at its heart – to keep you seen on the road – but it’s a smart little light, too. The battery-saver mode provides 30 minutes of additional runtime when the juice reaches 5%, while Ant+ and Bluetooth Smart connectivity means you can pair the light with your Garmin computer. 

For example, you can programme the Flare RT to automatically turn on whenever your computer is powered up, or you can keep an eye on the battery life using one of your Garmin’s data screens.

Tooo Cycling DVR80 review

(Image credit: Charlie Allenby)
Best cheap Garmin Varia alternative

Specifications

Maximum lumens: 80
Battery life: up to 8 hours
Rechargeable: Yes

Reasons to buy

+
Great light for day and night riding
+
Impressive waterproofing
+
Clear recordings in all conditions

Reasons to avoid

-
Slightly complicated set-up
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No accompanying app/head unit connection capabilities

The DVR80 pairs a brilliant rear light with a clear action camera that’s able to record in 1080p. The 80 lumens light is bright enough to be used during the day and at night, with claims by Tooo Cycling that it is visible one mile away.

The camera records clear footage in a variety of conditions. While it lacked the image stabilisation capabilities of the best GoPro, it's able to capture car license plates from upwards of five meters – important if you need video evidence after an accident or close pass.

The biggest failing of a rear light is often its durability in the face of the UK’s winter conditions. The DVR80’s IPX5 waterproofing passed our tests with flying colours during a month of use. It does come with a two-year warranty, though, if things don’t work out long-term.

Read our full Tooo Cycling DVR80 review

Garmin Varia RTL515 ReviewT3 Approved badge

(Image credit: Garmin)
Danger-sensing radar rear light

Specifications

Maximum lumens: 15
Battery life: up to 5 hours
Rechargeable: yes

Reasons to buy

+
Adds extra safety to a ride
+
Light is plenty bright enough
+
Small and easy to remove
+
Works nicely with bike computers 
+
Impressive battery life

Reasons to avoid

-
Mounts are quite bulky

Yes, it’s an expensive rear light, but the Garmin Varia RTL515 quickly becomes a permanent fixture on any regular cyclist’s seat post purely because it offers an extra element of safety and peace of mind. Even if it doesn’t directly save your life, it at least makes life in the saddle a little more comfortable, as it provides a nice early indication of rapidly approaching vehicles, rather than leaving it to the shock of one passing unannounced.

Cleverly, Garmin kept the dancing light tech of its original (fugly) unit, so fellow road users get a notification via a flash when they get within around 30m of the back of your bike. If they hadn’t seen you before, they will now, and some might even give a little more room when passing as a result.

Read our full Garmin Varia RTL515 review

The Thousand Traveler bike lights attach via a magnet and twist-lock.

(Image credit: Future)
Best rear bike light with a magnetic mount

Specifications

Maximum lumens: 80 lumens
Battery life: up to 22 hours
Rechargeable: yes (USB-C)

Reasons to buy

+
Quick and easy attaching
+
Attention-getting blinks
+
Easy controls
+
Compact form factor

Reasons to avoid

-
Finicky to mount
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Side visibility lacking

The Thousand Traveler bike lights are a solid option providing exceptional visibility to others on the road. They’re a bit lacking in side visibility, and the headlight doesn’t offer much of a beam for spotting obstacles on the road, but this is a handy option for city riders who have well-lit streets and want extra-convenient lights that just help protect them from drivers.

Read our full Thousand Traveler Bike Light review

Moon Nebula on white backgroundT3 Approved badge

5. Moon Nebula

Best affordable bike rear light

Specifications

Maximum lumens: 180
Battery life: 20+hrs
Rechargeable: yes

Reasons to buy

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Lightweight
+
Cool design
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Maximum visual impact

Reasons to avoid

-
Possible mounting issues

This neat little package arguably offers too much light for a rear light, which will only ever be a problem for those regularly riding in groups, but the Moon Nebula's super-bright LEDs are perfect for riders who want to alert fellow motorists to their presence.

A day flash mode gives a lower output to preserve battery levels but still affords good visibility, while the flashing night mode bangs out the maximum 180 lumens. The light's long, thin shape might not fit every mounting requirement, although plenty of mounting options are included in the box, so you should be able to find a space somewhere for the lights with a bit of searching.

See.Sense ICON+ on white backgroundT3 Approved badge

6. See.Sense ICON+

The best rear bike light with smart features

Specifications

Maximum lumens: 250
Battery life: up to 15 hours
Rechargeable: yes

Reasons to buy

+
Smart features
+
Very bright

Reasons to avoid

-
Hard to fault really

Think of the See.Sense ICON+ as a little computer for the back of your bike, rather than a basic bunch of LEDs, as it packs plenty of smart features to justify the above-average outlay. In short, it connects to a smartphone and bespoke app, so you get low battery alerts and charge indications to your device, while GPS is used to alter the brightness and flash pattern at busier junctions.

It mounts using a simple toolless system and offers up to 15 hours of run time, or 2-3 at the super bright 250-lumen max output. Oh, and it's a theft alarm, too – although, obviously, that requires you to leave the expensive light unit attached to the bike when parked. That aside, great light for use both day and night, while the additional smart functionality is a welcome addition.

Lezyne Strip Drive Pro Y11 on white backgroundT3 Approved badge

7. Lezyne Strip Drive Pro Y11

A handy cycle tail light for daytime use

Specifications

Maximum lumens: 300
Battery life: 20.30hrs
Rechargeable: yes

Reasons to buy

+
Stupidly bright
+
Lots of light modes
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Aero design

Maximum power and brightness are achieved in the Lezyne Strip Drive Pro thanks to five ultra-high-output LEDs stacked into one retina-scorching package. A Mode Memory function returns to the selected mode even after turning the unit off, and nine combined lumen and flash modes, including the extremely visible 300-Lumen Daytime Flash mode, make it nice and flexible for most rides. The high power output means battery life isn't the longest, though. It also boasts a unique aero and round post-compatible design, so it fits those swanky carbon fibre race bikes that are popular with the evening club ride crowd.

Apeman Seeker R1 4K Action Camera Smart Bike Light ReviewT3 Approved badge

(Image credit: Matt Kollat/T3)
Smart bike rear light with removab;e action camera

Specifications

Maximum lumens: Up to 100 Lumens in 'Fast flashing' mode
Battery life: Up to 5 hours
Rechargeable: Yes

Reasons to buy

+
Removable, full-fledged action camera
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Real-time feedback via the Go Ape app
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Plenty of accessories and two spare batteries included in the box
+
LASER LANE PROJECTION!

Reasons to avoid

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Go Ape App is buggy (for now)
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Bulky unit
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Would be better if you could take the housing off the bike quicker
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Laser only visible in low-light conditions
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No SD card provided in the box

The Apeman Seeker R1 Smart Cycling Camera is a bit of a mixed bag in terms of features, but it's certainly a whole lot of fun to use. We love the versatility and a million accessories it comes with; you can use the Seeker One as a standalone camera on a selfie stick or mounted on a helmet.

This bike light/camera combo can not only record your rides – what's happening behind you, anyway – but it can also project a laser bike lane on the ground, helping motorists keep a safe distance from your bike. The light is most visible in the dark, but thankfully, the Seeker R1 is also a decent rear light, capable of producing up to 100 lumens of light in fast flashing mode.

The Seeker R1 unit is bulky and might be slightly in the way when you ride. Although the Seeker One is easy to remove from the case, the case itself is a bit tricky to install and unmount; you won't have to do it often, but if you leave the bike in an unsafe area, it might take longer to remove and add the Seeker R1 case back on, especially without tools.

Read our full Apeman Seeker R1 review

Cycliq Fly6 on white backgroundT3 Approved badge

9. Cycliq Fly6

An excellent rear light with an HD camera built in

Specifications

Maximum lumens: 100
Battery life: not quoted
Rechargeable: yes

Reasons to buy

+
Built-in action camera
+
Fully weatherproof
+
Incident detection mode

Reasons to avoid

-
Rear footage not usually very useful
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No night mode

The Cycliq Fly6 is another rear light with a twist – it's also a 1080p video camera. Cycliq's light/camera hybrids have become much more advanced in recent times, with a higher resolution, higher light output and better mounts.

Video captured from the rear of a bicycle probably isn't going to win any Best Picture categories at the Oscars, even if it is full HD, at 60fps, with a wide 135º angle lens. In fact, its only use is likely to be if the worse really does happen, and you, or your next of kin, need to hold someone accountable for a rear-end shunt.

The Fly6 will 'lock' footage shot before and after it senses it is tilted more than 30° from horizontal, a bit like a car dashcam, so the video can't be overwritten.

Also included: four light setting modes, two flash settings and a maximum high power mode of 100 lumens. There's also a setting that conserves battery when it's on its last legs, giving a full half an hour to get home, according to Cycliq.

Garmin Varia RCT715 review

(Image credit: Charlie Allenby)
The Garmin Varia RTL515 update adds a camera

Specifications

Maximum lumens:
Battery life:
Rechargeable: Yes

Reasons to buy

+
Radar alerts
+
Great light for day and night riding
+
Good compatibility

Reasons to avoid

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Expensive for what it has to offer
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Camera isn’t as good as alternatives
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App user experience leaves much to be desired

For the RRP, the Varia RCT715 is likely to be out of most amateur cyclists’ budgets but is a welcome addition to the safety-focused cycling tech world from Garmin. If you already own its predecessor (the Varia RTL515), I wouldn’t bother upgrading.

In fact, for the same price, it would be possible to buy yourself one of the older versions and use the money saved to buy an all-out action camera, which would be able to record any incidents when on your bike as well as the fun parts – POV shots in picturesque places and general action sport snaps.

Read our full Garmin Varia RCT715 review

How to choose and fit the best rear bicycle lights

The job of a front light is, at least in part, to illuminate the road ahead, as well as to attract the attention of motorists. On the other hand, rear bike lights are all about road safety – making yourself visible to other road users.

Needless to say, the consequences of a rear-end shunt can be severe, so it’s a wise idea to invest in a bright rear light to attract the attention of those around you. In fact, it’s the law. According to UK legislation (the Road Vehicles Lighting Regulations 1989, fact fans), it's illegal to cycle on a public road after dark without lights and reflectors. You’re unlikely to get pulled over if you eschew the latter, but lights are essential.

Rear cycle lights aren't only needed at night. In low light, fog or dappled shade, cyclists can be more difficult to spot on the road, especially if you like to look chic in all black kit. The same even goes for when it’s a beautiful day as a super-bright rear light can help keep you seen when riding into a dazzling low sun.  

Due to the fact a rear light is only required to act as a safety beacon, rather than providing illumination to see by, it doesn’t have to be as powerful as a front light. Twenty lumens is a reasonable starting point, but the latest and greatest lights can pump out up to 300 lumens. If you plan on using your rear lamp during the day, the brighter the better, as it has to work harder to stand out - but be careful not to dazzle other road users at night. Also look out for lights with a range of settings, so you can tailor the brightness according to the riding conditions and battery life.

Even the most powerful rear lights tend to be a lot cheaper than the brightest front lamps, with the most expensive dipping below £150, and the average being way lower. It's possible to pick up a basic but powerful rear light for less than £20 so it’s difficult to justify going without.

Fitting rear lights should be simple, with most opting for a rubber strap or a simple plastic ratchet system that clamps around the seatpost. The rubber strap is our favoured system - it's so brilliantly simple, yet reliable (when done well) and means you should also be able to mount the light on an aerodynamic seatpost, as well as a conventional round design. Today’s designs are so slick that we look back on vintage lights with their elaborate metal and plastic clamping systems and wonder, "what were they thinking of?"

Most rear lights are now USB rechargeable, so while you may need to plug it in more often than you’d have to switch a set of regular batteries, it’s a doddle to keep the juice topped up. To be on the safe side, some riders even employ two rear lights, so that if one fails or runs out of charge/battery you're not unwittingly left without. Helmet-mounted lights are another great back-up option as they can be more visible than a seatpost light, which can be obscured by overhanging jackets (watch out for that!) or panniers.

Some rear lights are also designed to attach to backpacks or clothing, once again offering the chance to increase your illumination on the road, especially as they are mounted much higher than an under-seat light for improved visibility in heavy traffic.

So, in short, there's no excuse for not lighting up. Rear lights are more affordable and brighter than ever before, so you should be able to find something that fits your budget and riding style. Now let’s take a look at the best rear lights you can get for your money.

Even more info the subject of bike rear lights can be found here: how to choose the best front and rear bike lights. For those who need just one more article before they make a purchase.

FAQ

What is the brightest rear bike light?

How bright is too bright when it comes to bike rear lights? If your answer is 'nothing is too bright', consider the Lezyne Strip Drive Pro 300, a red blinker with 11 different modes and a staggering 300-lumen light output.

You might think that 11 different modes for a bike rear light is a bit of an overkill and although we agree, but we also think it provides a lot of flexibility to riders to cheese the correct output for any riding session. You might want to have the max output mode on when it's foggy and you simply can't skip a training session, while other times, especially in broad daylight, a lower power setting might just be enough.

Probably it goes without saying but the 300-lumen 'DAY FLASH 1' mode is not the most battery saving option, but even on that mode, the Lezyne Strip Drive Pro 300 will last for 'up to' five hours on a full battery. Surprisingly, lower light output modes, such as the 50-lumen 'BLAST', will drain battery life more than the retina-scorching Day Flash 1.

What is the best rear light right now?

For the sheer weight of features, it is difficult to top the Garmin Varia models, but we also love the Tooo Cycling DVR80 for its bright light and reliable camera and the Apeman Seeker R1 for its versatility. Of the more traditional lot, the super-bright and smart design of the rather more straightforward Bontrager Flare RT is a clear winner.

Leon Poultney

Leon has been writing about automotive and consumer tech for longer than he cares to divulge. When he’s not testing the latest fitness wearable and action camera, he’s out in a shed fawning over his motorcycles or trying not to kill himself on a mountain bike/surfboard/other extreme thing. He's also a man who knows his tools, and he's provided much of T3's drills coverage, all without injuring himself. He's now the editor of The Gear Loop, where he gets to try even more rugged and adventurous kit.