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Product Colors and Sizes

Mountain Bike Helmet ST 50 - Black

Regular price:

Sale price: 7.000 KD

Special product, Innovation Special product, New Release Special product, Sale End series Personalize me Eco-design Same day delivery

This mountain biking helmet is designed for your first rides.

With this ST 50 cycling helmet, you can protect yourself from branches and bumps while out riding. It is easy to position, with two buckles under the ears and one under the chin.

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Sale price: 7.000 KD

Regular price:

Product Features

A photo of the Mountain Bike Helmet ST 50 - Black in use

User comfort

Put on a well-fitting helmet with foam pads that you can forget you're wearing


Adjust the helmet using the 2 buckles under the ears and one under the chin


Its 15 ventilation holes let air move through

Impact protection

Complies with EN 1078


Size M: 265 gSize L: 310 g

Product Reviews

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1737 reviews

Mountain Bike Helmet ST 50 - Black
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The best helmet i had ever used!

this is so good


I bought two of these both for adults and one has a big head and one has a small head and a medium suited both.

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Bike helmet


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I think the quality of this item in alarming. Okay it’s very reasonably priced and i should’ve known it wouldn’t be amazing due to this however for a safety product i don’t think it’s safe enough.

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needed to exchange as no size small

Needed to exchange as no size small

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Uncomfortable helmet

Very uncomfortable helmet, at least for me. It can't fit my head properly. I bought according to my head circumference and it just doesn't fit. Literally every time I put it on my head I have to adjust the straps which is very annoying.


Comfortable good value helmet

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Mountain Bike Helmet


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Good basic entry helmet

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good for the money

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Poor fit and little adjustment

Unfortunately, despite following guides and measuring as advised, the helmet is too big and the adjustment method for this helmet is ineffective. I will need to return when shops reopen and will buy an alternative (from Decathlon online) in the meantime.I hope that delivery charge is still refundable as unable to return until shops reopen. I should have read the translated reviews before purchase as this appears to be a common complaint.



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Light weight

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Mountain bike helmet

It’s light and great value for money it your on a budget this helmet is great fits nice and snug , does the job

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Additional Product informations



  • 100% EPP - Expanded Polypropylene


  • 100% Polycarbonate


15 VentsChinstrap fastening: clipOccipital adjustment: noneCushioning foam: removableVisor: fixed, removableOuter shell: bonded polycarbonateSize M dimensions: Length: 31 cm, Width: 22 cm, Height: 15 cm

How do you choose your mountain bike helmet size?

To find your helmet size, simply measure your head circumference (around the forehead).This mountain bike helmet is available in two sizes:M: 54 - 58cmL: 58 - 62 cm

En 1078 certified

European standard that specifies requirements and test methods for helmets before being worn for inline skating, skateboarding, scootering and cycling. The corresponding test requirements and methods cover the following aspects: construction, including field of vision;shock absorption properties; retention system properties, including the chinstrap and fastening devices; marking and information.

When should i replace my helmet?

We recommend replacing your helmet in 2 cases:1/ After a fallIn the event of a fall, the material of your helmet can deteriorate or even break. Sometimes, you won't even notice. That is why we recommend replacing it if you have the slightest doubt.2/ After 5 years of useThe foam of your helmet degrades over time. It can deteriorate due to impact, where it is stored, the climate, and its use. We recommend replacing your helmet at least every 5 years

How do you adjust the helmet?

Follow these 2 quick steps to adjust your helmet in 5 minutes:1/ Clip the 2 straps with the buckle: check that you can still slide 2 fingers between the strap and your chin.2/ Adjust the straps so that they form a "Y" on each side of your ears. Just below the ear.The helmet should be in contact with your head, without tipping forward, backward, or sideways, even when you're moving.

Product tests

Our team of product designers based at the B'Twin Village in Lille is continuously working to make cycling more comfortable for our users.Our obsession is to create products that meet the specific cycling needs of our users and eliminate things that get in the way of their rides.

A rating to compare products' environmental impact.

A product's environmental impact is calculated for its entire life cycle using various indicators.An overall rating (ABCDE) is given, allowing you to easily identify products with the best environmental performance by comparing similar products to each other (T-shirts, trousers, backpacks etc.).Decathlon openly displays the environmental ratings of its products.To find out more:

Returns conditions for personal protective equipment

Make sure that this product fits properly.If you do need to return it, you will need to make sure it still has its instructions, labels and, where applicable, original packaging. so that it can be reconditioned. Let's take care of our planet, together. conditions:

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