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ROCKRIDER Ref. 8529457 2665615

24 Inch Kids Mountain bike Rockrider ST 920 Alluminium 9-12 Years old - Khaki

Tax included
Not available

Store Availability

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.


Brake control

Front/rear hydraulic disc brakes: POWERFUL AND PROGRESSIVE BRAKING

Ease of use

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


Air suspension fork, Skinwall tyres for less weight, 9 speeds

Cycling comfort

Sports saddle combined with an aluminium seat post for greater comfort



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.

Don't be scared of riding downhill!

Powerful, progressive braking thanks to the front and rear hydraulic disc brakes.

The disc brake acts on the wheel axle to deliver powerful braking under any conditions (dry, wet, muddy, etc.).

Single chainring drivetrain

This bike is equipped with speed controls that are controlled using the thumb and index finger, allowing effortless changes between the 9 speeds. The 36-tooth single chainring and 11-36 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 air suspension for cushioning on uneven terrain

This 24" ST 920 bike comes with an air fork that adapts to the child's weight.

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

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 guard over the chain stops it jumping.

Double-wall rims

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.

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°

Washing 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.


Regarding the tyres, the photos or videos on the bike's description sheet may display a tanwall tyre with high studs. However, due to supply challenges, the bike may be equipped with different tyres with lower studs.



Bike frame: 100.0% Aluminium

Tips for storage and maintenance

Storage tips

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.

Restrictions on use

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


Parts guarantee

Lifetime (frame, stem, handlebars). Find out more about the bike guarantee.