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Rockrider ST 500 Kids' 20-Inch Mountain Bike Ages 6-9 - Neon

Sale price: 84.000 KD Regular price:
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Sale price: 84.000 KD Regular price:
Model: 8405035

Product Features

A photo of the Rockrider ST 500 Kids' 20-Inch Mountain Bike Ages 6-9 - Neon in use

Rockrider ST 500 Kids' 20-Inch Mountain Bike Ages 6-9 - Neon : We have designed this mountain bike for children ages 6 to 9 (120 - 135 cm tall) who go mountain biking regularly.

To ensure riders can easily overcome rough terrain, we've equipped this 20-inch MTB with a suspension fork. Easily overcome hilly paths with the 6 speeds.

Ease of use

Equipped with a grip shifter to easily change gears (6 speeds).

Brake control

New Easy break brake levers are sized for children's small hands.


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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1316 reviews

Rockrider ST 500 Kids' 20-Inch Mountain Bike Ages 6-9 - Neon
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Lovely first bike for my lad


This is my son's 4th bike from Decathlon and he's only a month over his sixth birthday. Bike arrived on time only few days after the order was placed. Screwed on the pedals and inflated the tyres and went off for a 8km ride. He loved it. Frame appears to be well made and solid. A good choice of components, he found the grip shift very instinctive to use and the brake levers easy for his smaller hands. Only issue was that the brake cables needed to be clamped tighter at the brake caliper. But the basic tools supplied sorted this in a few seconds.



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Excellent value

Grandson thrilled to bits with his new bike. It is very good value. It includes one or two extras which other makes do not. Staff were excellent and were insistent on setting it up properly. Good all round

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Hello Atters and thank you for your review. One of our key values is responsibility so I'm pleased to hear that our technicians insisted on correctly setting up your Grandson's new bike. I'm glad you felt it was good value and I hope he and you enjoy the bike for years to come. Remember you can have a free service after 3 months on any new bike from Decathlon so bring the bike in for a check up later in the year. Our workshop team are available for repairs or questions in the meantime. Hope to see you again soon.


Xmas pressie

Superb quality bike and great in-store service

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Missing piece

Christmas present x just set up in the living room ready for Christmas day and both pedals missing

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really nice bike

our son loves his new bike

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Great Value and quality

Overall we are very pleased with this bike, its just right for our grandson. The only reason it didn’t get 5 stars was it is just a bit on the heavy side for such a small bike.

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Fantastic Bike

Bought 2 bikes the same but different colours for my kids. Cheaper than the Halford equivalent and the kids preferred riding them. Said they were smoother and easier to ride and for me a saving of £140 across the two bikes. Whats not to like!

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Brilliant Kids Bike

Bought a pair of these bikes for my kids instead of a similar one from Halfords. It was £70 less and I gave my kids the choice and they both preferred the Decathlon bike. Its great for them as we have fields arounds us so they can off road now without any problems. Great bike and great value for money.

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Great bike

Lovely bike, easy to use for first bike with gears, highly recommended

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Страхотно колело

Колелото е много добро. Синът ми го кара с удоволствие. Единствения недостатък е, че няма степенка и трябва да се закупи отделно.

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Много добро колело

Активно се ползва повече от седмица. И се държи отлично. Само липсата на първоначална окомплектовка със степенка и липсата на такава в магазина беше неприятно.

Колело от Декатлон

Колелото е страхотно вече го използвахме няколко пъти.Супер е

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Dětské kolo 6-9let s odpružením, barva křiklavá

Vhledem k odpružení trošku dražší než bez odpružení, s tím se ale dá počítat. Super, že je včetně světel, po domluvě nám personál nainstaloval i stojánek. Byli jsme spokojení již s prvním kolem 16" bez odpružení, tak jsme opět volili tuto značku a po 2 vyjížďkách spokojeni.

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Additional Product informations



  • 100% Steel

Frame designed for mountain biking

Our engineers have designed a new sturdy 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 gear

This bike is equipped with a grip shifter to change between the 6 speeds: an easier, safer system as the child's hands stay on the handlebars.This makes changing gears to match the terrain simple and easy!

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.


The new chainset has a 140 mm crank that is designed for a child's leg length. This chainset allows you to start pedalling more easily. The crank is covered to prevent the child from coming into contact with the metal part.The double chain guard prevents the chain from derailing.

Riding position

When mountain biking, it is important to control your path. To make it easier for children to learn, our engineers installed a handlebar and stem that are combined into a single steering block. This eliminates the needs for adjustments, so they can stay focused on the road!

20" wheels and mtb skinwall tyres

The tyres are designed for mountain biking. The lateral lugs provide good grip on turns. 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 indicated on the side of the tyre (2 to 3.5 bars). 20" inner tube, 1.7" to 2.2" 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: 140cm.Height: 80cm.Width: 54cm.

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: 431.6 mmSeat tube length: 285 mmChainstay length: 360 mmSeat post length: 300 mmHead angle: 68.8°

Additional Recently viewed


Size Guide Visual