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
- 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 Kids' ST100 20" Mountain Bike - 3'11" to 4'5"
A sturdy, single-speed, 20" white bike that's simple to ride. Equipped with front and rear lights and a bell, it can be ridden around town as well as on trails.
See shipping rate at checkout
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.
Product Videos
Product Features

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.
Questions & Answers
There are no questions
Be the first to post a question
Product Customer Reviews

My son loves the bike and enjoys riding it. nothing to point
Good quality children's mountain bike that is used every day
I was satisfied. Well done again 👏
Pleased with the purchase surprise for my grandson really happy
Good luck
Let quality always be your concern
RAS
The bike is very practical for a beginner.
Ras
Within 3 months had spent more time in the shop than being ridden problems with gear,brake,chain etc. Customer service mainly poor to non existent first time purchasing a bike from Decathlon seriously considering contacting consumer trading.
good bike
Very helpful staff looking forward to other visit when the time comes!!!
The bike is really top my son is delighted and uses it often I recommend for decathlon quality as usual
Price quality
Faulty braking I started repairs from the 1st day of purchase which is not normal at a price of almost 600 dinars
Additional Product Information
Composition
Bike frame : 100.0% 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
-
Research and development
delivers high-quality cost-effective products
-
State-of-the-art production processes
minimize manufacturing costs
-
Optimized supply chain
reduces retail prices
-
Minimal retail footprint
lowers overhead and indirect costs

Rockrider Kids' ST100 20" Mountain Bike - 3'11" to 4'5"
Your location: City, ST
Please enter a valid city with state or zipcode. Example: San Francisco, CA or 94101
Order online for
Heavy products return policy
If you return a product you will receive a refund for the purchase price plus any applicable sales taxes, less any non-refundable charges.
Decathlon will cover all shipping costs associated with your return except for items excluded from our return policy such as bikes, basketball hoops, snowboards, surfboards, tents, and other larger / heavier items.
Return costs for heavy products:
Weight Thresholds | Shipping within California | Shipping outside of California |
---|---|---|
> 9 lbs | $20.00 | $25.00 |
> 30 lbs | $50.00 | $65.00 |
> 100 lbs | $100.00 | $125.00 |
> 200 lbs | $200.00 | $230.00 |
If you return a product at any of our store locations, we will gladly help you find the best alternative product or refund you on the spot.
