Product Colors and Sizes

Rockrider ST 120 Kids' 20-Inch 6-9 Years Mountain Bike - White/Blue

Regular price:

Sale price: 1,075 SAR

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

We have designed this mountain bike for 6 to 9-year olds (120 to 135cm) wanting to start mountain biking.

To take on the first slopes, our engineers have equipped this kids' MTB with 6 speeds. This bike allows the rider to take on sloping terrain.

Color: Choose a color

Select a size

Select the size {{ cleanSize }} before adding this product to your cart.

Sale price: 1,075 SAR

Regular price:

Product Videos

Product Features

A photo of the Rockrider ST 120 Kids' 20-Inch 6-9 Years Mountain Bike - White/Blue in use

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.


Tyres with side lugs for good grip in the turns.

Cycling comfort

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

Product Lifestyle Image gallery

Image gallery





Product Reviews

Skip to reviews AR en
1336 reviews

Rockrider ST 120 Kids' 20-Inch 6-9 Years Mountain Bike - White/Blue
Filtered by translation missing: Loading reviews…
Rockrider 120 20 inch kids mountain bike

Really pleased with this bike. Very well built and comes with front and rear lights. The team at the Rushden Lakes store made sure it was safety checked and ready to thanks for that! Also has quick adjust saddle which is an added bonus. Bought for an 8 yr old and he is really happy with it.

icon-circle-checkmark Verified purchase

So happy to know you are satisfied with your bike and the service our team provided. Don't forget to come back for your 3 months free service soon!



Велосипедът е чудесен. Като цяло не отстъпва на по-скъпите на пазара. Единствен недостатък - малко по-тежък.

icon-circle-checkmark Verified purchase

От всички най доволен е синът ни.

icon-circle-checkmark Verified purchase
Kolo super, ale kolo by být levnější

Kolo super, ale mohlo by být levnější

icon-circle-checkmark Verified purchase
Velmi doporučuji

Velmi doporučuji. Skvělé kolo za dostupnou cenu.

icon-circle-checkmark Verified purchase
Fajn kolo pro děti

Nevýhoda je, že řazení je velmi těžké a 6 leté dítě nemá téměř šanci používat převody.

Malé výlety

Perfektní kolo na krátké výlety, máme jako druhé na chatě a úplně dostačující. Jediná nevýhoda je váha. Součástí jsou přední i zadní světla. Oceňuji ochranu přehazovačky!

icon-circle-checkmark Verified purchase

Syn je naprosto spokojený

icon-circle-checkmark Verified purchase

Kolo v pořádku jen jsem při vyzvednutí déle čekal omylem mi připravili jiné kolo toto museli teprve smontovat...

icon-circle-checkmark Verified purchase
Pro děti určeného věku ideální

Z kola panuje nadšení.

icon-circle-checkmark Verified purchase
dobré kolo

doporučuji. Rozhodně vynikající poměr cena/kvalita.

icon-circle-checkmark Verified purchase

Jsme spokojeni, za tu cenu dobrá koupě.

icon-circle-checkmark Verified purchase

Hezké kolo a ještě za dobrou cenu ;)

icon-circle-checkmark Verified purchase

Syn vůbec neuměl jezdit na kole tu sedl manžel ho chvilku držel a ejhle syn jezdí suuuuper

icon-circle-checkmark Verified purchase

Velmi dobrý

icon-circle-checkmark Verified purchase
Skip to reviews

Additional Product informations



  • 100% Steel

Frame designed 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.

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.

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.

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 crank is covered to prevent the child from coming into contact with the metal part.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°

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.

Product Recently viewed


Size Guide Visual