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Mountain Bike Helmet 500

Sale price: 15.500 KD Regular price:
Color: Choose a color
Size: Select a size
Sale price: 15.500 KD Regular price:
Model: 8328686

Product Videos

Product Features

A photo of the Mountain Bike Helmet 500 in use

Mountain Bike Helmet 500 : This well-ventilated, adjustable mountain biking helmet is designed for rides lasting over 2 hours.

This comfortable helmet is easy to adjust thanks to its dial, and protects your head from branches and impacts. Its comfy foam padding makes you forget about it. Bonus: 21 ventilation holes.

User comfort

Forget it's there: its comfortable removable foam pads prevent pressure points.


The 3D tightening system guarantees a good hold during your rides.


Don't get too hot: air circulates through the 21 vents.

Ease of use

Make your life easier: adjust the straps and the wheel to fit your head

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Product Reviews

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6275 reviews

Mountain Bike Helmet 500
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Rock ride

Comfortable to wear and well adjustable

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Great all round bike helmet

Good fit, light weight and head does not get too hot due to the ventilation holes.

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Very good quality and colour I like it.

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Basic lid for a basic price.

Sufficiently adjustable. All ok.

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Decathlon great value for money

Just started out biking. Was shocked at how cheap and how good quality most of the products on offer at decathlon are. Would Highly recommend to any starting out

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Good looking and comfortable

Just recently got back into cycling. Got this helmet, good price, comfortable and easy to adjust. What more do you need?


Great item

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Good overall product comfortable and safe

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Great helmet

Order this online. A great purchase!

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Comfortable and great price

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Excellent Helmet

The helmet is very comfortable to wear and easy to adjust. Very good quality.

Very good helmet

Light weight, beautiful, well manufactured, and a great piece in this price. Fit the head. Protects the head. Stylish. I got one and I am enjoying my rides. I would recommend it because it is a very good product and I would like to see riders enjoying their rides. Cheers.

Bike helmet

Bought by my wife. They don't do a small size?

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Hello Andy,

For this model of helmet only M and L sizes are available. We thank you for shopping with us and hope to see you soon again in our stores.

Have a nice evening and wish you to stay safe. Take care of you and your family.

Decathlon Milton Keynes



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Great fit

Great fit. Great price, and fits my lizard licks waterproof cover.

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Additional Product informations



  • 100% Expanded Polystyrene


  • 100% Polycarbonate


  • 100% Polyamide


  • 100% Polypropylene

How do you choose your mountain bike helmet size?

To work out your helmet size, simply measure the circumference of your head (at the forehead). The ST 500 MTB helmet is available in two sizes:M: 53 - 59cmL: 59 - 61cmPlease note: for safety reasons, helmets cannot be returned.

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 i adjust my helmet?

3 quick steps to follow 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.3/ Finally, adjust the tightness around your head.The helmet should be in contact with your head, without tipping forward, backward, or sideways, even when you're moving.

How to attach/remove the visor

This Rockrider ST 500 mountain bike helmet has a detachable visor.Unclip and reclip it whenever you want using the connector on each side.However, we recommend keeping it on your helmet during your mountain bike rides. It protects you from branches, sun, and spray.

Compatible accessories

This helmet is not adapted to attach a headlamp or other lighting source. Do you want to film your rides with a mountable camera? For your safety, we recommend attaching your sport camera directly onto the handlebars or on your torso with a suitable harness.

Combining sport & safety

The helmet can seem restrictive at first. The Rockrider team is unanimous: for mountain biking, helmets have an important role to play.Moreover, we all wear a helmet. For us, helmets are essential. Don't forget to wear one! ;)

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