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Rockrider ST500, Mountain Bike, 20", Kids 3'11" to 4'5"
To ensure riders can easily overcome rough terrain, we've equipped this 20-inch MTB with a suspension fork. Easily overcome hilly paths with the 6 speeds.
See our return rules for heavy items
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Free pickup
San Francisco, 735 Market St. Options
Select an available color and size to see options.
Product Videos
Product Features
Easy to use
Equipped with a grip shifter to easily change gears (6 speeds).
Brake control
New Easy break brake levers are sized for children's small hands.
Efficiency
Suspension fork. Skinwall tires for less weight, with side knobs.
Cycling comfort
A saddle with a sporty design, sized especially for children.
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Product Customer Reviews
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Got this (from Santa) for my 6 year old. Pedal fell off on first outing! How dyou explain that to a child. Would give 1 star but I’m giving decathlon the benefit of the doubt that maybe this was just an oversight by the ‘elf’s’.
Great price.quality product. Excellent customer service. Thankyou.
Thank you for your kind words, Anthony.
We really appreciate you taking the time to leave us your feedback.
Have a great day and we hope to see you again soon.
Emily
Sports Advisor (Customer Service)
Decathlon Wednesbury
Decathlon UK Limited. Company number: 03140144. VAT number: GB679262296.
Registered office: 9 Maritime Street, London, SE16 7FU.
Looks a good stable bike. Great service from all the staff that was involved with the purchase.
Good
Great bike and first one for my grandson and he loves it
Very good value for money and excellent professional customer service at Decathlon Warrington. I highly recommend this product and this store.
Excellent quality bike (I needed two for my twin grandsons) for Christmas. I had seen bike online and was staying with my daughter in Suffolk when we visited Cambridge Decathlon to look at bikes, I was so impressed by both the bike and the helpfulness of staff I purchased immediately. Alison a happy nan
Very strong bike, but the accessories like mud guards were very flimsey. Buying of helmet fitted when bought within weeks became small and could not extend the straps anymore, The bottle holder recommended does not hold properly, Bit disappointed as this was bought for my Grandsons birthday and he chose the extras which your sales advisor advised.
Brilliant bike shame my grandson has got to wait until Christmas
Perfect
My 6 yr old loves it... The gears are so good and easy to use. The style of this bike is so cool and bright.
I bought my son a bike for his 6th Birthday. He sat on it and the seat wasn’t fitted properly so I thought nothing is it and fixed it myself, he hadn’t ridden it for more than 5 minutes and the peddle fell off. Either the parts are faulty, or the staff member is.
excellent cycle
Son stepping up and not looked back spot on and not stupidly dear despite good components
Bought for my 8 year olds birthday. He absolutely loves it. Great quality as always with Decathlon bikes.
Size Guide
Additional Product Information
Composition
Bike frame
- 100% Steel
Frame designed for mountain biking
Our engineers have designed a new sturdy steel frame. The frame's rear chainstays are short, making the bike responsive 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 gear
This bike is equipped with a grip shifter to change between the 6 speeds: It's safer and easier for children as they don't need to let go of the handlebar to change gears. This makes changing gears to match the terrain simple and easy!
Controlled braking
2 V-Brake pads for effective braking. These brakes are composed of calipers 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 from any impact.
Crankset
The new chainset has a 140 mm crank that is designed for a child's leg length. This chainset allows you to start pedaling more easily. The crank is covered to prevent the child from coming into contact with the metal part. The double chain guard prevents the chain from derailing.
Riding position
When mountain biking, it is important to control your path. To make it easier for children to learn, our engineers installed a handlebar and stem that are combined into a single steering block. This eliminates the needs for adjustments, so they can stay focused on the road!
20" wheels and mtb skinwall tires
The tires are designed for mountain biking. The lateral lugs provide good grip on turns. The tires are made with SkinWall technology. This process reduces their weight and makes them more flexible, which increases performance, grip and comfort. The recommended tire pressure is indicated on the side of the tire (2 to 3.5 bars). 20" inner tube, 1.7" to 2.2" Schrader valve.
Bike accessories
This MTB is equipped with a bell, wheel reflectors and platform pedals. The frame is also compatible with other B'Twin accessories: - front and rear mudguards - stand - bottle cage - saddle bag - stabilizers
Dimensions of the bike ready to use
Length: 55.1". Height: 31.5". Width: 21.3".
Origin
Imported
Storage instructions
Store the bike in a clean, dry place. Clean and grease the chain regularly. Our advice for before each ride: inflate the tires to the pressure indicated on the sidewall.
Guarantee
Lifetime (frame, stem, handlebars). Find out more about this bike's warranty.
Free Shipping Over $35
Exceptions Apply
Free In-Store Pickup
Free Returns
Exceptions Apply
Over 91% 4-5 Star Reviews
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 ST500, Mountain Bike, 20", Kids 3'11" to 4'5"
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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.