Ideal for commuters, road riders and gravel riders who want a compact rear light with strong side visibility and smarter safety features for everyday riding.
The Knog Cobber Reflex Rear Bike Light is built for riders who want to be seen clearly in traffic, at intersections and anywhere cars approach from the side as well as from behind. The standout here is the 330° beam arc, which gives this light a much broader spread than a typical rear blinker. In real use, that wider wraparound output is exactly why Cobber lights have built such a strong following with commuters and road riders who care about side visibility as much as straight-line brightness.
What makes the Reflex version different is the extra intelligence. Adaptive Reflex technology adds features like brake-responsive brightening, tilt response when you lean the bike, and automatic on/off, so the light reacts more actively when riding conditions get busy. You also get ModeMaker 2.0 customisation if you want to fine-tune modes for longer runtime or a simpler setup. For everyday use, we like that it stays compact at 39 g, charges by USB-C, and includes multiple silicone straps to suit standard and aero seatposts.
This is a premium rear light, and it makes the most sense if visibility is your top priority rather than lowest-price shopping. If you ride in urban traffic, early mornings, winter commutes or shoulder-hour road loops, the Cobber Reflex gives you a noticeably more distinctive light signature than narrow rear-facing designs. It’s a smart choice for riders who want high visibility, easy fitment and modern sensor-based features in one tidy package.
330° wraparound beam
The broad beam arc helps you stand out not just from directly behind, but also from side streets, roundabouts and multi-lane traffic.
Adaptive Reflex response
The light reacts to speed changes, braking and bike lean, giving following traffic a clearer visual cue when your ride gets more dynamic.
Brake Mode built in
When you slow down, brightness increases automatically so riders and drivers behind you get a more obvious signal.
ModeMaker 2.0 customisation
You can tailor flash patterns, brightness and active modes to suit commuting, daytime visibility or longer battery life.
Compact and light
At 39 g, it adds very little bulk to the bike and is easy to leave fitted full-time.
USB-C rechargeable
Modern charging is simpler and easier to live with than older proprietary plugs, though you’ll need to supply your own cable.
Standard and aero seatpost compatible
The curved body and included strap options make it easier to fit cleanly on a wide range of seatpost shapes.
IP67 waterproof rating
Well suited to year-round riding and wet-weather commutes when your rear light needs to keep working through spray and rain.
General
Battery & charging
Light modes & runtime
Dimensions & weight
Compatibility
Materials & construction
What's included
Features
Adaptive Reflex technology
We get a rear light that reacts to the way you ride, adjusting to speed, bike lean and surface changes so you stay more visible when conditions get busy or unpredictable.
Tilt Reflex Mode
When you lean into corners or change line through traffic, the light adapts to help keep you seen from more angles.
Brake Mode
When you slow down, the light increases brightness automatically so riders and traffic behind you get a clearer signal without you touching a button.
Auto On/Off
Built-in sensors switch the light on and off for you, helping save battery and making sure it is ready when you roll out.
ModeMaker 2.0
We can tailor brightness, flash patterns, mode count and selected product features to better suit your riding, whether you want longer runtime or a setup that stands out more in traffic.
Chip On Board (COB) LEDs
COB LEDs deliver a bright, punchy output in a compact light, helping you stay highly visible without adding bulk to your bike.
Great for
Maybe not for
Fits 22–32 mm+ posts and tubes, and the included small, medium and large silicone straps help cover a wide range of setups. It is designed for standard and aero seatposts. As with most strap-mounted rear lights, check clearance if you run a saddle bag, very deep rear wheel position, or an unusually shaped aero post.
vs Magicshine SEEMEE 300
The SEEMEE 300 is a strong alternative if you want lots of features and excellent battery life for less money. It stands out for value and mounts, while the Cobber Reflex leans harder into wraparound visibility and a slimmer, lighter form factor.
vs Exposure Boost-R ReAKT
The Exposure is a premium smart rear light with brake-reactive behaviour and a strong reputation for build quality. The Cobber Reflex is the better choice if side visibility and flexible fitment matter more than a more traditional rear-facing beam.
vs Lezyne Strip Drive Rear
The Lezyne is a simpler rear light option with good power and straightforward operation. The Cobber Reflex justifies its higher-end positioning with smarter features and a more effective wraparound light signature.
Best used as a be-seen light
This is the sort of rear light we recommend for visibility in traffic, dawn starts and changing road conditions rather than as a substitute for a high-powered trail or off-road light system.
Great match for aero road bikes
Because it is designed to work with both standard and aero seatposts, it suits modern road and gravel bikes better than many older rear lights that only really sit neatly on round posts.
Allow space if you run a saddle bag
Before buying, check how much room you have behind the seatpost. Compact though it is, any rear light can be partly blocked by a large saddle bag or low saddle position.
Custom modes are worth setting once
If you like a simple setup, it’s worth trimming the mode list to the patterns you’ll actually use. That makes daily operation much quicker when you’re rolling out before work or heading home in fading light.
Technically UnKonventional
Knog is an Australian accessories brand founded in Melbourne in 2002 by Hugo Davidson and Mal McKechnie. The company built its name on cycling products that combine industrial design, everyday usability and a distinct visual identity, and it has expanded from bike accessories into selected outdoor gear as well.
Knog is especially well known for rethinking familiar products in a more design-led way, with major products including the Frog light, the Oi bell and the Cobber light range. Its products and brand have received multiple design awards over the years, including Australian Good Design and Eurobike-related recognition.
