JR Mountain bike ST920 8-12Y Norme CN

NON-MEMBER : $4,599
Ref. : 8619512

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 kids' mountain bike has a light aluminum frame for maneuverability and hydraulic disc brakes for effective braking.

Color: meleze green

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Our services :

  • Free delivery for Decathlon brands orders above $399
  • All Decathlon products are eligible for lifetime return

Products benefits

Ease of use

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

Brake control

Front/rear hydraulic disc brakes: POWERFUL AND PROGRESSIVE BRAKING


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

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.

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. It is 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.


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

Product concept & technology

Product Composition

Bike 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 Restrictions

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

Maintenance advice

Rinse in clean water after use.


To have more informations about this product, consult the notice

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