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Sale price: 1,150 SAR

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This mountain bike is designed for children who are aged 9 to 12 and planning to go biking often. It's suitable for kids with heights between 135 and 150 cm.

For comfortable rides on rough terrain, we've equipped this 24" MTB with a suspension fork. Easily overcome slopes with the 18 speeds.

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Sale price: 1,150 SAR

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Product Videos

Product Features

A photo of the 24 INCH KIDS MOUNTAIN BIKE ROCKRIDER ST 500 9-12 YEARS OLD in use

Ease of use

With two grip shifters to easily change between the 18 speeds.

Brake control

Two V-Brake pads for effective braking.


Suspension fork. Skinwall tyres for less weight, with side knobs.

Cycling comfort

A saddle with a sporty design, sized especially for kids.

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Product Reviews

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3800 reviews

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Terrible product

We purchased this bike in November 2020 as our son's 2020 Xmas 2020 gift. After 1 year of occasional use we have discovered that the chain is loose and jumps off the cogs during gear changes. My son has fallen whilst this has happened. Given this problem of the chain jumping we fail to see how this product could be used safely as a mountain bike on trails/ rough terrain. The most recent accident due to the chain jumping led to the front wheel being bent and the brakes damaged. Given it has been more than 1 year since purchase we took it to a local repair shop.. His verdict: that's what you get for a bike of that price!

Make sure the bicycle is assembled properly!

I just picked up my son's new bicycle yesterday morning from your store. Yesterday afternoon while my son was riding the bicycle in the local park I noticed that my son's feet was coming off from the pedals very often. Today I decided to accompany my son, riding the bicycle in the local park as well. I was standing looking at my son when he suddenly stopped because the left pedal just fell down on the ground. He was riding the new bicycle on the tar surface inside the park. My son was very lucky that he didn't injure himself. He could easily have lost his balance. This is unacceptable. I tried to attach the pedal inside the park, but I couldn't do it. There was a loose piece of metal tread inside the area that was supposed to be attached to each other. I managed to fix it properly at home with my adjustable spanner.

Hello Fernando,

We are sorry about the negative experience you had in our store.

We value the customer experience and customer service as the most important part of our business.

We appreciate your valuable feedback and we will report it to the team in order to improve.

Kind Regards.

Bike for my sons birthday

Top quality bike...

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The salesman is very attentive and professional.

The bicycle department salesman of Milton Keynes is very careful to understand about our needs. Although the shop does not have the actual goods of this bike, we still believe that this gentleman’s recommendation and purchase of this bicycle are very suitable for us.

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Fantastic value for money

Used the click and collect service for the Southampton branch, the bike was built and ready to collect within 3 hours. Great service and my little boy love the bike

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It is the first bicycle that I bought for my daughter and I recommend it to her.

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Best birthday present

Easy to put together and ride away. Package was well protected.

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Great bike but cable ties scratched the frame.

Really happy with bike, it has really good build quality. My only whinge is the cable ties were so tight on the frame they scratched the stickers. Slightly annoying tbh.

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Dangerous product

I bought this a few years ago and today my son had a dangerous fall as a result of the seat suddenly collapsing despite regular checks and tightening.

Excellent !! service and great bike

My daughter loves her bike. Really well made and excellent product I would like to commend Decathlon on customers service. Great advice buying the bike and the service to get the bike to me before the shops shut due to the Coronavirus was outstanding. I don’t normally write reviews, but had to this time Thanks folks !!

Rock rider

Excellent service Instore. Free home delivery. Excellent quality bike.

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Just what we wanted

An excellent bike, delivered on time I damaged with minimal assembly required.

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Epic bike

It has good steering.It's got good brakes

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скърцащи спирачки

колелото rockrider st500 е голямо разочарование. Имахме предходния модел с 20' инчови джанти и нямахме никакви забележки, докато при st500 предната джанта фабрично е леко крива и задните и предните спирачки са пренатегнати и трябваше реглаж. Въпреки последното спирачките са супер скърцащи и детето отказва да го кара :@


Благодарим Ви, за отделеното време да споделите обратната си връзка за нашия продукт!

Като спортна компания, която се стреми да направи спорта достъпен за всеки, нашата цел е винаги да предоставяме качествени и функционални продукти.

Спортни поздрави,

Екипът на Декатлон България

Чудесно колело за дете!


icon-circle-checkmark Verified purchase


Благодарим Ви, за отделеното време да споделите обратната си връзка за нашия продукт!

Като спортна компания, която се стреми да направи спорта достъпен за всеки, нашата цел е винаги да предоставяме качествени и функционални продукти.

Спортни поздрави,

Екипът на Декатлон България

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Additional Product informations



  • 100% Steel

A frame that is suitable for mountain biking

Our engineers have designed a new, robust steel frame. The frame's rear chainstays are short, making the bike responsive and easy to handle.

Front suspension to cushion unpredictable terrain

Take on new challenging terrain (roots, stones, gravel, etc.) with ease thanks to the travel of the front suspension fork.

Changing between the 18 speeds

This bike is equipped with 2 grip shifters to make it easy to change between the 18 speeds.Left (chainrings): control ascents/descents.Right (speeds): more precise control over your pedalling.

Controlled braking

Two V-Brake pads for effective braking.These brakes are composed of callipers that exert more or less pressure on the rim to slow or stop the rotation of the wheels.

A reinforced, ergonomic saddle

A saddle with a sporty design, designed with care to adapt to the morphology of children. It is equipped with a plastic section on the rear (a bumper) to protect against any impacts.

Riding position

To provide you with maximum comfort, this mountain bike is equipped with a high-rise stem. Your position on the bike is slightly raised so you can better anticipate your trajectory.


The new chainset has a 152 mm crank that is adapted to the length of your child's leg. This chainset allows you to start pedalling more easily. The crank is covered with a guard to stop you coming into contact with the metal part.

24" wheels and skinwall mtb tyres

To transport the bike, we’ve made it easy to remove and attach the front wheel. It is equipped with a quick-release system.The tyres use SkinWall technology. This process reduces their weight and makes them more flexible, which increases performance, grip and comfort.The recommended tyre pressure is displayed on the tyre sidewall (between 2 and 3.5 bar).24-inch 1.7 to 2.2 cross-section inner tube with Schrader valve.

Bike accessories

This MTB is equipped with a bell, lighting, wheel reflectors and platform pedals.The frame is also compatible with other B'Twin accessories:- front and rear mudguards- stand- bottle cage- saddle bag- stabilisers:

Dimensions of the bike ready to use

Length: 160cm.Height: 100cm.Width: 56 cm.

What if i order online?

For smoother shipping, our bikes come with their pedals removed and the handlebar unscrewed (instructions and tools are supplied)

Frame dimensions

Top tube length: 478.6 mmSeat tube length: 345 mmChainstay length: 415 mmSeat post length: 300 mmHead angle: 68.2°

Photos non binding

For the drive train parts (freewheel and derailleur), the photos or videos provided on the product description show a Shimano derailleur and a Spark freewheel. However, because of procurement issues, an equivalent, derailleur and cassette from a different brand may be present on the bike.

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