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Rockrider ST 100 Kids' 20-Inch 6-9 Years Mountain Bike - White

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Sale price: Dhs. 680.00 Regular price:
Model: 8405033

Product Features

A photo of the Rockrider ST 100 Kids' 20-Inch 6-9 Years Mountain Bike - White in use

Rockrider ST 100 Kids' 20-Inch 6-9 Years Mountain Bike - White : We have designed this mountain bike for 6- to 9-year-olds (120 to 135 cm) who want to start mountain biking.

We've designed this robust, easy to use (1 speed) 20-inch children's MTB for discovering mountain biking.

Ease of use

This single-speed bike is simple and effective on flat terrain.

Brake control

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


Tyres with side lugs for good grip in the turns.

Cycling comfort

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

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Product Reviews

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575 reviews

Rockrider ST 100 Kids' 20-Inch 6-9 Years Mountain Bike - White
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The Bike is amazing - gave my son the confidence he needed to start riding a bike ! Great value, great bike

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Hi Angela,

We are happy to hear that your son's new bike was a success!

Thank you for taking the time to leave your review.

Take care and have a great day!


Sports Advisor (Customer Service)

Decathlon Wednesbury

Decathlon UK Limited. Company number: 03140144. VAT number: GB679262296.

Registered office: 9 Maritime Street, London, SE16 7FU.

Good solid bike

Reviewing after 18 months, bike is excellent and my son is now confident and riding this bike.


I had brought this bike for my little boy and its perfect. The bike was built and it even came with lights front and back. This is the perfect bike for your younger ones to start mountain biking and decathlon staff guiltbrook were fantastic.

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Perfect child’s bike

The bike sizing was exactly as listed, build quality was much better than expected for the price and very little to do in the means of assembly. Very pleased and will buy from Decathlon again.

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Purchased for 5 year old. He loves it, perfect

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great single gear bike


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Без степенка

Велосипеда е без степенка и няма налична от този размер, за да си я закупя

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Благодарим Ви за отделеното време и оценката, която сте дали за нашия продукт. Информираме Ви, че нашия Национален център за обслужване на клиенти ще се свърже с Вас за съдействие относно избора на подходяща степенка.

Спортни Поздрави,

Екипът на Декатлон България!

Супер колело на супер цена

Колелото е супер. Малкия го подкара от раз и го кара с лекота. Трябваше да купим допълнително калници и стойка, защото не са включени в базовия модел. Мисля, че е съотношението цена-качество е оптимално.

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Чудесен детски велосипед

Синът ми е влюбен във велосипеда. Повечето деца на тази възраст им идва много да управляват и скорости. Следващият му велосипед ще е със скорости.

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super pro dítě které se učí na kole

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Perfektní kolo pro syna, sednul a jel..

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Synovy se kolo moc líbí a jezdí se mu na něm prý suprově. Takže já tento výrobek rozhodně doporučuji.

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syn je spokojny,

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Výborné kolo dětského věku

Kolo je výborně provedené. Na sedmiletou holčinu výborné! Když ho někde nechá fláknuté, nevadí vám to, protože stojí tolik kolik stojí :oD Dcera to kolo miluje, její starší bratr na něm také rád jezdí....

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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.

Why have we created a brake lever specifically for children?

Because children have smaller hands than adults, it's not always easy for them to reach the brake lever. This is why our engineers designed a brake lever that is closer to the handlebars and thus easier to hold.

Single speed

With only one speed, the bike is simple and remains effective on flat terrain.

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

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!


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 double chain guard prevents the chain from derailing.

20" wheels and mtb tyres

The tyres are designed for mountain biking. The lateral lugs provide good grip on turns.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.

Mtb fittings

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°

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