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Rockrider ST500 Mountain Bike 24" Kids 4'5" to 4'11"

Sale price: $119.99 Regular price: $349.00

To ensure riders can easily overcome rough terrain, we've equipped this 24-inch MTB with a suspension fork. Easily tackle hilly paths with the 6 speeds

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Sale price: $119.99 Regular price: $349.00

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Final Sale: No returns or exchanges

Free returns

Free pickup

San Francisco, 735 Market St. Options

Select an available color and size to see options.

About this item:

  • 100% Steel Frame
  • Rockrider Front Suspension Fork
  • 6 Speed B'Twin by Microshift Drivetrain
  • Aluminium Wheels with front quick relaease
  • V-Brake system front and rear
  • Child Specific Ergonomic Saddle
  • Lifetime Warranty on the frame
Model: 8629908

Product Features

A photo of the Rockrider ST500 Mountain Bike 24" Kids 4'5" to 4'11" in use
A photo of the Rockrider ST500 Mountain Bike 24" Kids 4'5" to 4'11" in use

Rockrider ST500 Mountain Bike 24" Kids 4'5" to 4'11" | We have designed this mountain bike for 9- to 12-year-olds (135 to 150 cm) wanting to regularly go mountain biking.

To ensure riders can easily overcome rough terrain, we've equipped this 24-inch MTB with a suspension fork. Easily tackle hilly paths with the 6 speeds

Easy to use

With grip shifter to easily change between the 6 speeds.

Brake control

Two V-Brake pads for effective braking.


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

Cycling comfort

A saddle with a sporty design and a shape adapted to kids' bodies

Product Lifestyle Image Gallery

Image Gallery

Rockrider ST500 Mountain Bike 24 

Rockrider ST500 Mountain Bike 24 

Rockrider ST500 Mountain Bike 24 

Rockrider ST500 Mountain Bike 24

Questions & Answers

Product Customer Reviews

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Rockrider ST500 Mountain Bike 24
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Christmas present from our son and he is more than delighted with it.

No comment

No comment

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Super nice team

Super nice team

Excellent purchase

Excellent product

Excellent product

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All perfect

The bike is great

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Excellent product, obviously not one of the best but it fully satisfies my choice of mountain bike for my children, this is the second one purchased in two years, so I already knew the product, and soon I will purchase another one with a little more accessories

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Rockrider ST500 MTB Bike 24" Fluo Yellow Kids

Excellent also for a smaller child, with the saddle lowered and the right height

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Bike purchased for my nephew, he feels great using it.

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Designate, robust, my son…

Designed, robust, my son loves it

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The bike was bought for my daughter and later intended for my son. This is not the first bike bought for a child from Decathlon. I recommend it, very durable and comfortable. the service in Deathlon is very helpful and not expensive, and as you know, service is also a very important thing when buying a bike. I highly recommend. We also bought bicycles for adults at Decalhlon.

Good bike

Good bike

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Size Guide

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Additional Product Information


Frame (for bike): 100.0% Steel

A frame that is suitable for mountain biking

Our engineers have designed a new, robust steel frame. The frame's rear chainstays are short to make the bike dynamic and easy to handle.

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.

Changing between the 6speeds

This bike is equipped with grip shifter to make it easy to change between the 6 speeds - more precise control over your pedalling.

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 cover at the back (a bumper) to protect against any impacts.

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 adapted to the length of your child's leg. This chainset allows you to start pedalling more easily. The crank is covered with a guard to stop you coming into contact with the metal part.The double guard over the chain stops it jumping.

24” wheels and skinwall mtb tyres

To transport the bike, we’ve made it easy to remove and attach the front wheel. It is equipped with a quick-release system.The tyres use SkinWall technology. This process reduces their weight and makes them more flexible, which increases performance, grip and comfort.The recommended tyre pressure is displayed on the tyre sidewall (between 2 and 3.5 bar).24-inch 1.7 to 2.2 cross-section inner tube with Schrader valve.

Compatible accessories

KIDS BIKE STAND 100 (Model Code 2694189)20” & 24” KIDS BIKE STABILIZERS (Model Code 8550741)

Storage instructions

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.


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



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Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

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    Minimal retail footprint

    lowers overhead and indirect costs


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