Product Colors and Sizes

  • Black Friday product
  • New Deal product
  • Cyber Monday product
  • Clearance product
  • Deal product
  • Best Seller product
  • Ecodesign product
  • New product
  • Staff Pick product
  • In The News product
  • Innovation product
  • product

Rockrider ST100, Mountain Bike, 20'', Kids 3'11" to 4'5"

Sale price: $150.00 Regular price: $249.00

A sturdy, single-speed, 20" white bike that's simple to ride. Equipped with a bell, it can be ridden around town as well as on trails.

Color: Select a color
Size: Select a size
Sale price: $150.00 Regular price: $249.00

Free shipping over $35

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.

Model: 8549158

Product Features

A photo of the Rockrider ST100, Mountain Bike, 20'', Kids 3'11" to 4'5" in use

Rockrider ST100, Mountain Bike, 20'', Kids 3'11" to 4'5" | Designed for 6 to 8 year old children who are beginning to learn to ride a bike.

A sturdy, single-speed, 20" white bike that's simple to ride. Equipped with a bell, it can be ridden around town as well as on trails.

Easy to learn

Single-speed, simple and efficient bike. Bike weight 24.3 lbs.

Bike safety

V-Brakes provide powerful and easy braking.

Lifetime warranty

B’Twin offers a lifetime warranty on the frame, stem, handlebar and rigid fork.

Product Customer Reviews

Skip to reviews
33 Reviews
Write a Review 





Rockrider ST100, Mountain Bike, 20'', Kids 3'11
Filtered by reviews Loading reviews…
At 100

I bought this bike for my grandson. Bike came by mail 90% assembled. My grandson liked it very much. The rear tire keep losing air. We are keeping an eye on that. It looks like some kind of leak.

Great bike for kids!

This bike is great! Simple for my son to work the brakes. Great quality. Super easy to put together. Customer service is also fantastic.

Best Kid's Mountain Bike

Satisfied with this product.

icon-circle-checkmark verified purchase

Hello and good day to you Mr Zairul Hezry,


We at Decathlon Shah Alam are delighted to hear that you are satisfied and happy with your purchase of the Rockrider ST100 Kid's 20" Moutain Bike. Friendly reminder that we offer 6 months FREE service, 2 years warranty for the entire bike, and lifetime warranty for the stem; handlebars; rigid fork; and frame (excluding all wear and tear).


We hope to see you soon whether it be here at Decathlon Shah Alam or any other of our branches and offer you the best of service. For any inquiries please feel free to contact us at 03-55243599 .

Thank you immensely,


Ammar,

Wheels Sports


Wan Ammar
7/30/2022
Great Bike Kids (Beginner)

Rockrider ST100 bike is sturdy with easy adjustable seat that's comfortable and suitable for my kids (ages 9-11) who just started to learn cycling without the supporting wheels. They pickup cycling less than 15minutes :)

icon-circle-checkmark verified purchase

Dear Mahzura, thank you for your time in leaving us with a 5-Star rating on our product/service. We are glad that we managed to delight you with the standards of our product/service. We really appreciate your loyalty with Decathlon. Please let us know if there is anything else we can improve on in the future. Thank you once again for your time and we hope to serve you again soon!




Mohd azman
11/21/2021
20’’ Bicycle

Need to check on this as front wheel seems to be loose.

icon-circle-checkmark verified purchase

Dear Mr. Mohsin,


thank you for taking the time to write the review! We are truly sorry to hear that our product and service did not meet your expectations. We have read your feedback and will take note of these points into improving ourselves to better satisfy your needs. Thank you once again for your time and we hope to serve you again soon!


Khairil Hafiq

5/29/2021
Kids' Mountain Bike RR 20" ST 100 B'TWIN

my son loves it

icon-circle-checkmark verified purchase
Excellent price and service

I went to Decathlon to buy a bike for my 8 y.o. son. without any particular preference other than to get an affordable solution. Once in the store, I was pointed to the bike I ended up buying. The staff advised me on size, which I would have possibly guessed wrong, and price. This was the last piece in the store at the lowest price. They set up everything very quickly and I left the store quite satisfied with the bike and the service.

icon-circle-checkmark verified purchase
Bicycle

Good

icon-circle-checkmark verified purchase
Product review

Quite a comfy bike for kid

icon-circle-checkmark verified purchase
The Chain Is Too Loose

The Chain Will Come Out Many Times A Day, Very Frustrated

icon-circle-checkmark verified purchase

Hi Patrick,


Thanks for taking the time to leave a review of the ST 100 RR 20 inch Kids Bike! I'm sorry to hear about your difficulty with the chain coming off.


It sounds like the locknuts for the rear wheel may have worked loose and thus there is not enough tension to keep the chain on the sprocket or chainring.


Our Workshop Leaders will be more than happy to help you sort it out - you will just need to make an online booking here.


I will feed back to our Cycling and/or Production teammates about this - please rest assured that we take such feedback seriously and will work to improve our processes in the future. Thanks and have a great day!


Jason


Digital Sport Leader

Cycling & Roller Sports

5/12/2022
Bike

my 7 year old son's first bike. he likes it.

icon-circle-checkmark verified purchase
Kids' Mountain Bike

My daughter enjoys cycling on this bike so far

icon-circle-checkmark verified purchase
kids bicycle

good, the kids love it

icon-circle-checkmark verified purchase
Good quality budget upgrade

Our upgraded from 14" to 20", They're just almost reaching 120cm and once on the move, they're enjoying riding noon stop, Perfect for them for probably another 3 to 4 years use?

kids Mountain Bike RR20 ST 100 BTWIN

Right size for kids. handlebars stability and ease in control.

icon-circle-checkmark verified purchase
Skip to reviews

Additional Product Information

Composition

Bike frame

  • 100% Steel

Frame

The chainwheel anti-derailment device and low step-through frame make it easy to get on and off.

Accessories / equipment

Fully equipped for use on public roads (bell, reflectors). The rear derailleur guard protects the derailleur from damage in the event of an impact.

Origin

Imported

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

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs