Best bike rear light 2024 to keep you safe on the roads

The best bike rear light is more than just a red LED blinking away at the rear of your bicycle; it also provides an extra layer of security to your rides, no matter the light conditions. Some models even have built-in cameras that connect to your smartphone and alert you of potentially dangerous traffic situations as they unfold behind you.

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.

Much like how the best bike front lights will help you see in the dark and make you more visible to oncoming traffic, 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. Therefore, having an often inexpensive gadget doing its magic at the rear 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

Best overall

The Bontrager Flare RT was already one of our favourite lights, but this 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 program 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.

Best with built-in cam

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.

Best with built-in radar

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.

Best for easy mounting

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.

Best budget

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.

Best for daytime

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.

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.

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