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

Sale price: $130.00 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: $130.00 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
  • 18 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 Videos

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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Best of all, my son loves it

Children's MTB bikes 9-12

Excellent bike, ok price

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Everything as we expected

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It could have been better!

Good bike overall (quality/price ratio). The braking system is not the best. The gear ratios and ratios are a little lacking when shifting: sometimes it is necessary to force the gear knobs beyond the limit. Probably a matter of setup. With a little attention it could become a very reliable product. Structurally robust bicycle.

This magnificent mountain bike will…

This magnificent mountain bike will go into Santa's sack to spoil my 10-year-old granddaughter who was able to test it before choosing it. This year again, Christmas will be a successful celebration and it will also be thanks to Decathlon and its fantastic teams.

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Nice bike to take around.…

Nice bike to take with you. Very good value for money

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Children's mountain bike

Perfect, light



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I bought this bike...

I bought this bike for my son. This will be his future Christmas present in 2023. When purchasing, I ask the seller to sort everything out properly because I had a bad experience with the previous bike purchased new, the Rockrider ST120 (loss of a pedal during the 1st exit) Arriving in our underground garage, my child tests the bike. It made an incredible noise when braking. He takes a little speed bump and boom, the saddle suddenly goes down. Still disappointed by Decathlon and its Cycle department. In the afternoon, I return to Decathlon to check the brakes. I was told that on this bike, it always makes a horrible noise when you brake because the brakes are painted!!!! Fortunately I came across a lover of his profession in the store's workshop. He spent time to significantly reduce this awful noise. A big thank you to this gentleman! We agreed that if the bike made noise after 2 or 3 rides, I would go back and see it.

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Durability is number one

This is my child's second bike, I bought them both from Decathlon. I am very pleased.

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Best bike I've ever had :)

I recommend this bike 100%. Very easy to use and extremely beautiful physically and there you have it⭐⭐⭐⭐⭐


A happy child

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my son is very satisfied with it

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My son loves it

My son loves it

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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.



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.

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    Minimal retail footprint

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