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The Knog Blinder MOB Mr Chips Rear Light is versatile and powerful, giving you effective visibility during the changeable winter months. It has a decent battery life thanks to its use of LEDs, which also create a good level of illumination. The only slight issue I have is the way that it charges, which might not be ideal straight after a long, wet ride.
There are hundreds of rear lights out there, from those that film behind you or shoot lasers onto the road, to simple single-mode on/off units. The Knog Blinder leans towards the simpler end of the market, with five modes pumping out enough light to make sure you're seen.
The most important aspect of any rear light is how visible it makes you. The Knog Blinder is strong in this area, especially when you consider its 42 x 42mm size. It pumps out 44 lumens of light – not the brightest, but a decent amount.
One of its biggest positives is its versatility. Because of its fixture system it can be used on a variety of seat tube widths and shapes. I managed to fit it to regular seatposts, aero posts and mountain bikes really easily without needing to switch straps or brackets.
Like the front light of the same name and design, tested here, battery life is very much dependent on which of its five modes you use – the full 44 lumens on a steady beam, a slightly lower output beam, regular flashing, pulsing and flashing on left/right sequences. The full beam lasts for around four hours, but the lowest flashing mode is claimed to last for around 60. This was the mode I typically chose to use, and that certainly doesn't seem an ambitious estimate.
Another aspect of the mode sequencing I like is that it remembers which one you used last, so you can just turn the light on and ride, without having to cycle through to find the right one.
To help you identify when the battery's running out of power there's a charging light above the on button. It will also automatically switch to a lower power to save energy. Another useful setting is 'storage' mode, which drains the battery to an optimal level for storage if you are not going to use the light for a long time.
The only aspect of this light that I am a bit suspect of, and the same goes for the front light, is the way it charges – by plugging directly into a USB port. The USB element of the light is uncovered and I would be wary of charging it straight after wet rides. That said, it's not hard to dry it beforehand and the USB itself is totally waterproof, so water will not affect the light.
Overall, this is a really nifty and useful light for this time of year. Because of its good battery life and effective illumination it can essentially be left on your seatpost and just turned on when needed. The charging light is a nice addition too, and the versatility of where it can be fitted is a definite plus. The only thing that concerns me is how it plugs in to be charged, but that's easily remedied by drying the USB beforehand.
Powerful and small light, ideal for commuting in the dark winter months
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road.cc test report
Make and model: Knog Blinder MOB Mr Chips rear light
Size tested: n/a
Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?
It is aimed at urban cyclists who want to be seen, but without having a huge light on their bike. To help with this it is designed to be small, bright and easy to use.
I think that it certainly achieves this, with bright lighting, minimal space used on the bike and a long battery life.
Tell us some more about the technical aspects of the product?
LIGHT DIMENSIONS: 42 x 42 x 62mm
MATERIALS: UV-Resistant Industrial grade silicone. Polycarbonate Lens, Polycarbonate Optical grade PMMA Lens, Hard-Anodised aluminium fascia.
USB: Rechargeable Lithium Polymer battery
REAR OUTPUT: 44 lumens (LED Rating)
BIKE ATTACHMENT : Three removable silicone REAR light straps for posts 22-32mm+ and AERO POST COMPATIBLE
Well made, looks like it could certainly survive a fall, although with the well-made straps this is unlikely to happen.
Does exactly what it needs to, lights you up and makes you visible on the roads in the dark.
Long battery life, use of LEDs and the ability to put it in storage mode to conserve battery life longevity means that it is likely to last a long time.
You can get cheaper lights, but in terms of return on investment this offers good bang for your buck.
Tell us how the product performed overall when used for its designed purpose
Very well, the battery lasted a long time, the light was certainly bright enough, and it was simple to fit.
Tell us what you particularly liked about the product
The use of LEDs because they are both very effective and conserve battery life.
Tell us what you particularly disliked about the product
The exposed USB, although this can be easily wiped dry.
Did you enjoy using the product? Yes
Would you consider buying the product? Yes
Would you recommend the product to a friend? Yes
Use this box to explain your score
A light that can be put on your seatpost and almost ignored, just needing a charge once every 60 hours or so. It is an ideal commuter light.
About the tester
I usually ride: Cannondale Supersix Evo 6 My best bike is:
I've been riding for: 5-10 years I ride: Every day I would class myself as: Experienced
I regularly do the following types of riding: commuting, club rides, sportives, general fitness riding, fixed/singlespeed, mountain biking
George is the host of the road.cc podcast and has been writing for road.cc since 2014. He has reviewed everything from a saddle with a shark fin through to a set of glasses with a HUD and everything in between.
Although, ironically, spending more time writing and talking about cycling than on the bike nowadays, he still manages to do a couple of decent rides every week on his ever changing number of bikes.