SL100 Series

SKU: RE-00107

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Not suitable for bikes with disc brakes (see SL200 Series instead) and only for use in right hand traffic.

The SL100 Series is our classic range of hub-mounted lights, which are suitable for use on bicycles that do not have disc brakes or roller brakes. The SL100 Series is a smart set of magnetic bike lights with bright, clear illumination that ensures you always stand out in traffic.

This is the latest version (V3) with an all new design resulting in significant improvements in durability and performance.



Installing the bike lights is a fast and effortless process. The lights attach to the hub and are suitable for all bikes equipped with v-brakes or cantilever brakes. The bike light generates its own eco-friendly energy through the combination of a coil in the dynamo and magnets on the bike's spokes, eliminating the need for batteries. Once installed, the lights are fixed in place and accompany you on all your cycling adventures. With the lights always on while you ride, you can feel confident and secure on the roads, day or night. Say goodbye to dead batteries, forgotten lights, and unwanted resistance when cycling - these magnet-powered bike lights have got you covered.

ReePower™ Flash

The SL100 Series features ReePower™ Flash, a backup system that allows the lights to flash for two minutes while stationary.


The SL100 Series (V3) has been completely redesigned and now boasts significant improvements in durability and performance. Featuring an IPX7 rating, you can confidently leave your bike outside in heavy rain without worry. The updated electronics and increased magnetic strength also make the lights brighter than ever, ensuring that you stand out in traffic.

Choose the right option

SL100 Series is available in three versions: Flash (SL100), Flash with ReePower™  (SL120+) and finally a version with Constant Light (SL150 C).

Powered by magnets - No friction
Uses no batteries
Waterproof (IPX7) and tested for harsh weather conditions.
ReePower™ Flash
Continues flashing for two min.
Flashing light
Always on
- reduces accidents by 47%
Constant light
Bright safety light
Permanently mounted on the hubs
Environmentally friendly
Not suitable for quick release
without adapter

Customer Reviews

Based on 9 reviews
Ennio Dalla Francesca
Ho fatto una modifica

Sulla mia vecchia mtb ho ruote con ciao veloce tipo corsa e per installare la luce posteriore ho dovuto tagliare l'anello. Un piccolo lavoro di pochi minuti che mantiene la soddisfazione per il mio acquisto.

Grazie mille Ennio :)

Previous (original) version was better

I use reelight since long time .

The new SLxxx (1led) is worse than the original/previous version (2led) :
The original version had :
- a reflector inside the device as régulations ask for, the new version has NOT .
- A far better capacitor, the « old » 120 were blinking/flashing during long minutes after the ride stop (and quasi continuous lighting when riding at low temperature in winter with 3 magnets on the wheel) . The new version blink/flash at maximum 30s after the ride has stopped (even for a long ride and for 3 magnets on the wheel !) and you will never get continuous lighting (just flashes) even with high speed and cold temperature.

Reliability remains good as sources of failure are tiny (typicaly : break of the thin thin thin copper wire beetween coil and pcb because of vibrations, or the led burn because it’s of course not eternal) . Both are quite easy to fix fortunately) .

So the original version was better in my opinion …

Hello Guillaume,

Thank you for providing your feedback. The previous version you mentioned did actually not include a built-in reflector, as its purpose was mainly cosmetic. This is why we decided to remove the reflector like features. Since then, we have made significant improvements to the newer versions, making them more reliable than the older ones. If your light is not flashing for at least two minutes while stationary, please know that it is covered under our two-year warranty and you can file a claim at

Prone for moist

Although I do like the SL 100 – have been using several of them for some years now – very much but the truth is: they are prone for moist. Especially if you have to park your bicycle always outside as most of us have to do here in Amsterdam. Eventually it breaks down. Especially the front light. Why is a mystery to me. I very rarely park my bicyle in a bicycle rack. I just ordered my third replacement front light but if this one also drowns shortly I have to look for another light solution.

Hi Nico,

I am very sorry to hear about this experience. We offer two years warranty on any product purchased through us, so please contact us at if you think your light is covered. Thanks.

Okay, but great room for improvement

I am somewhat disappointed with the latching/assembly mechanisms of both the light and the magnet due to the lack of a good quality design. I mean, the screwing guide through a plastic material feels very cheap and non-precise. It is very easy to get misguided because the metal support is not well aligned either then once you start screwing in, there is not an easy come back because, again, it is plastic and it's quite complicated to adjust in general (therefore I am assuming it won't be possible to get them installed in another bike, unless picking a larger screws size each time maybe). I wanted to return them back (bought two sets at once for my two bikes), but since I managed to get them installed in an "acceptable manner", I did not proceed with the return. Simply there is no other acceptable alternative in the market. But again, the mechanism seems very low quality for such a nice overall idea of being more environmentally friendly - which it is what I was looking for at the end. Sorry for the honesty, but I know this is more helpful for you Reelight guys for continuous improvement :)

Hi Jorge,

Thank you for the feedback. We understand that installation can sometimes be a bit troublesome and we understand the frustration. Regarding the durability of the plastic there is no need to worry. If you should wish to move the lights to another bike you can do so without wearing down the threads and this can be done many times.

Tashi Iwaoka
Great product and customer service. A top brand.

I have been a fan of Reelight since my first purchase years back when I was living in Amsterdam.
As one I got was damaged and broken I made an order to ship it to Finland, where I live now.
The delivery was rather quick.
When I opened the product, I was a bit surprised - I didn't know/notice that there were three different versions and I got the flash one, instead of the constant which I had in my mind when ordered.
I anyway mounted it and all was fine - apart from feeling a bit too visible to others, which is just something Finnish about perhaps (though I'm not a Finn).
After one cold day (about -8), the front light started faint a bit. But got back normal again after some days.
A few weeks past the front light stopped working. It didn't come back to life again this time.
So, I contacted the company, asking if a replacement was possible.
They responded very quick and straight forward (contacted by CEO!).
I was ready to be said that was not possible but all is simple and they even said it's possible to send the constant version if I wished. Now all sorted and waiting for the constant version of the front light.
They are great and reliable in all levels.
I will enjoy the ride with Reelight again and for the coming long future :-)

Thanks a lot Tashi!