24 Inch Kids Mountain bike Rockrider ST 900 Alluminium 9-12 Years old - Red


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

This 24" mountain bike is made of durable, lightweight aluminium for manoeuvrability. The front and rear disc brakes on this kids' MTB offer powerful braking in all conditions.

Color: Scarlet red

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Product benefits

Ease of use

ALU frame and chainset for less weight. Quick release for removing the wheels.

Brake control

Front/rear mechanical disc brakes: powerful braking in all conditions


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

Cycling comfort

Sports saddle combined with an aluminium seat post for greater comfort

Technical information

A frame that is suitable for mountain biking

Our engineers have designed a new aluminium frame. Durable, lightweight and responsive: designed for tackling any obstacles when out mountain biking.

Controlled braking

Brake effectively thanks to the mechanical disc brakes at the front and rear.
The disc brake acts on the wheel axle to deliver powerful braking under any conditions (dry, wet, muddy, etc.).


This bike is equipped with speed controls that are controlled using the thumb and index finger, allowing effortless changes between the 8 speeds. The single 36-tooth chainring and 11-34 cassette make it easy to shift gears and deal with any kind of hill. With just one control to manage, you can focus on your trajectory.

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. Suntour fork with 50 mm of travel.

Comfort when riding

A saddle with a sporty design, designed with care to adapt to the morphology of children. Combined with an aluminium seat post (sturdy and flexible) for even greater comfort.

Riding position

To hone your steering, we have equipped this mountain bike with a short aluminium stem (70mm) and a 540 mm oversize handlebar. This makes you more precise and responsive on turns.

Aluminium chainset

The new aluminium chainset has a 152 mm crank that is suited to the child's leg length. This light chainset allows you to start pedalling more easily.
The double chain guard prevents the chain from derailing.

Double-walled rims and SkinWall tyres

The double-walled aluminium rims are light and durable.

For transporting the bike, we've made it easy to attach/detach the front and rear wheels. They are equipped with a quick-release system.
The tyres use SkinWall technology. This process allows you to reduce their weight, therefore increasing performance, grip and comfort.

24-inch 1.7 to 2.2 cross-section inner tube with Schrader valve.Pressure indicated on the tyre sidewall (between 2 and 3.5 bar).

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
- bag

Dimensions of the bike ready to use

Length: 160cm.Height: 100cm.
Width: 60cm.

Frame dimensions

Top tube length: 479.3 mm
Seat tube length: 345 mm
Chainstay length: 415 mm
Seat post length: 370 mm
Head angle: 68.2°


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

Care instructions

In order not to damage your bike, we do not recommend the use of a high pressure cleaner. Rinsing with clear water and a sponge is preferable.


for life (frame, stem, handlebars, rigid fork). Find out more about the bike guarantee.

Product concept & technology

Product Composition

Frame 100% Aluminium


Store the bike in a clean, dry place. Clean and grease the chain regularly. Our tips for before each ride: inflate the tyres to the pressure indicated on the sidewall.

User Directions

We recommend wearing a helmet.Maximum weight in use 80kg


To have more informations about this product, consult the notice


24 Inch Kids Mountain bike Rockrider ST 900 Alluminium 9-12 Years old - Red
24 Inch Kids Mountain bike Rockrider ST 900 Alluminium 9-12 Years old - Red
24 Inch Kids Mountain bike Rockrider ST 900 Alluminium 9-12 Years old - Red
24 Inch Kids Mountain bike Rockrider ST 900 Alluminium 9-12 Years old - Red
24 Inch Kids Mountain bike Rockrider ST 900 Alluminium 9-12 Years old - Red


Q:How to assemble your bike?

A: Everything you need to know about making sure your bike is comfortable, secure and ready to ride.

Q:Do you offer a Cycle To Work scheme?

A: Find out everything you need to know about way of getting to work that’s for good you and the environment. Check Here
Products sold and shipped by Partners are not eligible for Cycle to work Schemes

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