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Rockrider ST900 Mountain Bike 24" Kids 4'5" to 4'11"
THE 24" mountain bike.Aluminum frame, 8 speeds, trigger shifters, suspension fork and disc brakes; everything your child needs for a sporty, comfortable ride!
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 use
Alu frame, 8 speeds, trigger shifters,quick-release with front and rear wheel
Bike safety
Disc brakes, knobbly tires, derailleur guard, and Aheadset stem.
Cycling comfort
suspension fork
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Product Customer Reviews

The child is very happy with the bike!!!
My son is very pleased, the bike runs smoothly, is light and gives great riding satisfaction
My son loves his bike, which is very beautiful and durable. Very good advice from the sellers, I do not regret the purchase
Too stylish bike
Good mountain biking to start doing singles 👍
Bought for my 8 year old son. He is 1.27m tall and the bike is still a little big for him, but as he is comfortable on a bike, he already uses it. His previous bike was not a decathlon and we regretted it! Decathlon is a guarantee of quality and compatible accessories are easy to find! This bike rides great and my son loves it. in real life, it is more beautiful than in the photo!
Very satisfied
top
Certainly a little expensive but this mountain bike is still great for putting your child in the best conditions for learning mountain biking. Impossible to raise the handlebars it is at the maximum but that is not a problem in itself.
very good
My son is very happy with his new bike.
my son is enthusiastic about the bike
2nd bike we buy of this model. He's great.
Nice bike with good suspension for the brakes, which surely explains the high price.
Yes and good
Size Guide

Additional Product Information
Composition
Bike frame : 100.0% Aluminium 6061
Frame
Made out of aluminum for a lightweight frame.The Aheadset stem makes maintenance easy and makes the frame more sturdy for riding on any kind of terrain.Its rear S-bend stays optimize braking performance and make it easier to get through mud.
Suspension
Suspension fork to dampen vibrations from rough and rugged paths or terrain.
Drivetrain
Change gears (8 speeds) using trigger shifters (on the handlebar).
Brakes
Mechanical front and rear disc brakes for powerful, precise braking. Braking power is not affected by mud or bumps.
Handlebars / stem / steering
Suspension fork dampens vibrations on rough terrain for added comfort and better control.The Aheadset stem provides additional safety during all-terrain cycling.
Guarantee
Lifetime (frame, stem, handlebars). Details on btwin.com. Availability of spare parts: 2 years
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
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State-of-the-art production processes
minimize manufacturing costs
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Optimized supply chain
reduces retail prices
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Minimal retail footprint
lowers overhead and indirect costs

Rockrider ST900 Mountain Bike 24" Kids 4'5" to 4'11"
Your location: City, ST
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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.