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Btwin, City Bike Helmet

Regular price: $16.99 Regular price:

Wearing a helmet is no longer an inconvenience!This helmet is comfortable and can be easily adapted to the shape of your head using the adjustment dial. Lighting option for more peace of mind.

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Sale price: $16.99 Regular price:

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8609524

Product Features

Btwin, City Bike Helmet | protecting you on rides around town on roads, on cycle paths and in parks

Wearing a helmet is no longer an inconvenience!This helmet is comfortable and can be easily adapted to the shape of your head using the adjustment dial. Lighting option for more peace of mind.

A photo of the Btwin, City Bike Helmet in use

Shock protection

Complies with EN 1078: field of vision, shock absorption, chin strap system, etc


Stand out from the crowd thanks to the optional lights.

Anatomic design

Free your head with the adjustment dial and adjustable straps.


Get some fresh air with the 6 vents!

User comfort

Pamper your head with the washable foam inserts.

Weather protection

The "cap" shape protects you from the rain and sun so you can stay on track

Product Lifestyle Image Gallery

Image Gallery

Btwin, City Bike Helmet,base color

Product Customer Reviews

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Btwin, City Bike Helmet,base color
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Good value

Overall decent helmet. Looks weirdly big on my head and the outer plastic is extremely thin (like you can easily push it in and out) but the inner materials seem strong.

Excellent value

Good protection at an excellent value.

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Basic but does the job

Not if your size is 1 cm in the other upper limit by the next size up

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Cycle helmet

Love the look of Decathlons cycle helmet,reminds me of retro italian motor /Cycle sports helmet.

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Cycling helmet

£10 for a cycling helmet for my wife. Cheap as chips, looks good and does the elemental job of keeping her head safe.

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100 city

Comfortable good fit, great in warmer weather, we'll vented.

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Does the job

Good, but will be investing in something more sturdy in the future.

Excellent value

A valuable sports store

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Great helmet

Comfortable and beautiful

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Excellent product

As above plus excellent service Would highly recommend


Purchased for my daughter. One of the only styles she likes, it looks quite good and seems robust so far. The fit is good. Only issue is the lack of vents, however you can tell by looking at it that it was not designed with maximum ventilation in mind. So we can't complain.

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BTWIN 100 City Cycling Helmet Black

i got a size large and its an excellent fit for me its comfortable and also has great support for my head so i am insured a safe cycle. I have had many more expensive helmets which I must admit felt no more comfortable and light on my head. I wouldnt say it looks that "flash", but maybe thats a plus for some people. My daughter in particular says it does not look that cool, more like a horse riding helmet. As per all the other reviews and for Decathlon gear in general fantastic value for money and sporting excellence.


Arrived very quickly, Looks great, feels great & I don't look like a complete berk whilst wearing it (I sometimes wear a baseball cap with it too/under the helmet)

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Great mid range helmet - not too garish. Good adjustments and a handy light clip on the rear. I particularly like the fact it is one of those helmets which does not make you look like a Stormtrooper.

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Additional Product Information



  • 100% Polycarbonate


  • 100% Polypropylene


  • 100% Polyoxymethylene


  • 100% Polyurethane

En 1078-certified

Complies with bike helmet standard EN 1078. European standard defining the test requirements and methods applicable to helmets used for skull protection when cycling around town and for skating, scootering and skateboarding. The corresponding test requirements and methods cover the following aspects: construction, including field of vision; shock absorption properties; characteristics of the restraint system and resistance to penetration.


If you're between sizes, choose the bigger size. Choosing the right-sized helmet and getting the fit right is essential. For children, never buy a helmet that is too big on the assumption that they will grow.


For maximum protection, the helmet should be in close contact with your head, and the fastening system must always be correctly adjusted without being too tight around your forehead. When the straps are properly adjusted, the helmet should not slide forward, back or sideways. For this reason, there are several sizes available. We recommend that you try on different sizes to find the best fit.


Size S: 8.5 oz Size M: 8.8 oz Size L: 11.4 oz


This product has a hook for attaching a VIOO Clip, an LED light that can be clipped on anywhere and unclipped in an instant. With a red or white light that can be used in continuous or flashing mode, you are clearly visible from up to 120 yds. away. Accessories, such as mounted cameras, that have not been approved by the manufacturer may damage the helmet's features and affect its performance.

Main materials

EPS liner: Expanded polystyrene Outer shell: Polycarbonate


We recommend that you replace your helmet after 5 years starting from the manufacture date (shown on the label on the inside of the helmet). As damage may not be visible, we recommend throwing away and replacing any helmet that has suffered an impact Using solvents or other aggressive products could affect your helmet's effectiveness.



Storage instructions

Do not expose to high temperatures (over 122°F), and store in a dry place away from UV light.

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

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    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual