ST 100 RR 24" CN 2024

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9 to 12-year olds (135 to 150 cm) wanting to start mountain biking.

We've designed this robust, easy to use (1 chainring) 24-inch children's MTB for helping children to get started with mountain biking.

Home delivery

Check stock in-store

Our services :

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

Products benefits

Ease of use

Equipped with a grip shifter to easily change gears (6 speeds).

Brake control

Two V-Brake pads for effective braking.


Tyres with side lugs for good grip in the turns.

Cycling comfort

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

Technical information

A frame that is suitable 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.

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.

Changing gears (6 speeds)

This bike is equipped with a grip shifter to change between the 6 speeds: a safer and easier system because the child doesn't have to let go of the handlebar.
This makes changing gears to match the terrain simple and easy!

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 cover at the back (a bumper) to protect from any impact.

Riding position

To provide you with maximum comfort, this mountain bike is equipped with a high-rise stem. Your position on the bike is slightly raised so you can better anticipate your trajectory.


The new chainset has a 152 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.

24" wheels and MTB tyres

The tyres 24*1.95 are designed for mountain biking.
The recommended tyre pressure is indicated on the side of the tyre (2 to 4 bars). 24" inner tube, 1.85" to 2.2" Schrader valve.

Bike accessories

This MTB is equipped with a kickstand ,bell, wheel reflectors,platform pedals,front and rear reflector.
The frame is also compatible with other B'Twin accessories:
-front and rear mudguards; - bottle holder; - bike bags; - stabilisers

Dimensions of the bike ready to use

Length: 160cm.Height: 100cm. Width: 56cm.


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

Product concept & technology

Product Composition

Bike frame 100% Steel


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

User Restrictions

Wear a cycling helmet.

User reviews

Questions & Answers