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ST 540 Front/Rear USB LED Bike Light

Sale price: $39.99 Regular price:
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Sale price: $39.99 Regular price:

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Model: 8326392

Product Features

A photo of the ST 540 Front/Rear USB LED Bike Light in use

ST 540 Front/Rear USB LED Bike Light is designed for providing effective lighting when you ride in low-light conditions; for everyday use.

USB rechargeable, LED front and rear bike light set, approved for road use in France and Germany (STVZO). Made in France.

Visually efficient

Power: 10 lux Narrow beam Effective at low speed.


Power: 26 lumens (front) / 3 lumens (back) Visible at the back from 220°

Battery life

Front continuous mode: 2 hrs Back continuous mode: 4 hrs Rechargeable via USB


WHITE (1 mode) and RED (1 mode) Universal elastic mount


IPX 4: withstands spray and heavy, persistent rain.

Product Customer Reviews

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511 Reviews
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ST 540 Front/Rear USB LED Bike Light,black
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Easy to attach, remove and battery long lasting

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Small battery, broke on 2nd day

I took this for a couple of rides, front light battery gave out after about 1.5 hours of use with a very weird "turning off even if there's still battery left function", had to spend the last 5 minutes with my finger constantly pressing the button to get the last bit of light until I got home. I connected both lights to charge them and went to sleep, but when I got ready to use my bike again the following day, I found out the front light didn't turn on anymore. I tried connecting it to 3 different usbs using 2 different cables with no response at all. Going to ask for a refund tomorrow since this is absolutely unacceptable.

I'm sorry to read that there may have been a fault with these lights. You should get up to 2h of use out of the front light but it seems that there is a wide issue on this occasion.
I hope you were able to exchange or refund the lights and that the new set works well.
Peter, Cycling Manager, DECATHLON
Great quality

Great quality! Easy to fix to bike and quick to re charge with double usb connector provided

Battery life isn't good

I am normally a big Decathlon fan.. I bought these without looking at the battery life.. 2h & 4h. I'm commuting 45min morning and evening.. I have to recharge every day.. I would not recommend buying this product. For such a bulky light battery life should be better.

V100 road 500front /rear led usb. Bike light set

So easy to fit to bike, no tools required, easy to recharge

500 series front and rear light set

Lights are bright enough. Very easy to get on and off. Inconspicuous so they are not a target for theives. However the front light seems to require a daily charge. Plus the wires supplied are to short. We don't all use a laptop to charge them.

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Good Value Light Pack

These are a really good value set of front & rear lights. They are charged quickly (within an hour) via the supplied USB cable (nb: you will of course need a normal USB to main socket plug like the kind supplied with a mobile phone). They attach to the bike via a strong stretch rubber connector - so no fiddling around with screw connectors. The brightness of both lights are really good ...can't say how long the charge lasts as I've only used them for an hour at a time but this seems pretty good so far. Highly recommended..

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Excellent product

Loved the way can be charged even on I phone lead

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At the price the luminosity is not outstanding. But adequate. There is no flashing function which is surprising.

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Good but not great.

A little disappointed in how long the charge lasts, but the beam lights up the road well. Would have expected some flash modes for the price.

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Bright but battery life could be better

Could be better. Rear light appears to be upside down, as the diagonal section appears to be wrong way round. Front light only 1.5hrs charge max - not good

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Good brightness but no flash setting

As above, decent beam when charged, easily fitted in seconds, small and easy to store, DO NOT FLASH, flashing doesn't only save power it is also some what more noticible in the dark on paths and roads, the front beam for example looks like a torch from a pedestrian point of view, flashing would be more obvious that a bike may be coming other than a dog walker.

Suficiente relación calidad precio.

Se debería mejorar la fijación a la bicicleta

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Satisfecho con la compra

Calidad precio excelente

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excelente producto

cumple con las expectativas, es funcional y a un excelente precio

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Additional Product Information


Main fabric

  • 80% Styrene ethylene butadiene styrene
  • 20% Polycarbonate - Acrylonitrile butadiene styrene

Inner shell - Main fabric

  • 100% Battery - Lilo


  • 100% Polycarbonate


Thanks to feedback provided by cyclists and other road users (drivers, pedestrians, etc...), our design teams have defined optimum features linked to cyclists' visibility. With one purpose in mind: ensuring cyclists' safety.


Battery capacity: 200 mAh (500 cycles guaranteed) LED light power: - front LED light: 26 lumens, 10 lux - back LED light: 3 Lumen. Approved for road cycling in France and Germany (STVZO) Equipped with special lenses that focus the light so you can see in FRONT (at a speed of 9 mph) to avoid obstacles and be seen from behind from 220°.



Product testing

Laboratory tests have been carried out to approve the components: batteries, battery life, UV resistance, durability, etc. The final product is then tested to simulate the durability of the assembly over time. The light is fitted to a test bike to reproduce the vibrations of cycling on a road for thousands of pedal strokes.

Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual