B'Twin Rockrider ST 500 20" 6-9 Kids Mountain Bike
Not only do Rockrider produce a range of mountain bikes and electric bikes for adults, but there's also a handful of kid's models too. Here we have the ST 500 20" kids bike, which as the name suggests is a 20 inch wheeled children's bike currently priced at around £170.
For your money you get a small steel hardtail frame with an own brand suspension fork, weighing a total of 12.4kg / 23.3lbs.
As you'd expect at this price point, V brakes as supplied instead of the disc brakes which can be found on more expensive Rockrider models.
Rockrider also provide own brand wheels, complete with a quick release on the front for easy inner tube changes. The tyres supplied are their own 20" skinwall versions.
In fact, all of the main finishing kit is Rockrider own brand (as expected for this price range) inlcuding a single combined handlebar / stem unit; less bolts to worry about tightening.
The saddle has been designed with kids in mind, with a handy plastic rear section helping to prevent scuffs from ripping any fabric.
Again, the brake levers have been designed for little hands, given that this bike is aimed at 6-9 year olds, and the bike's cranks are 140mm in length rather than the 170mm-175mm of adult bikes.
These cranks power a 1x6 (1 chainring at the front and 6 cogs on the rear cassette) drivetrain, with gear shifting operated by a gripshift unit.
Flat and grippy plastic platform pedals complete the ST 500 20" build, with a bell and reflectors also included to keep your child safe.
More details on the ST 500 20" can be found below, or it's also available in a yellow colour scheme. If you wish to upgrade to disc brakes there's the ST 900 20" bike. For those who would like larger wheels, Rockrider also produce a series of 24" bikes; the ST 500 24", then the disc equipped ST 900 24" and finally the top of the range ST 920 24".
We have designed this mountain bike for children ages 6 to 9 (120 - 135 cm tall) who go mountain biking regularly.
- B'TWIN Steel Hardtail Kids Bike with Suspension Forks
- Part of the Rockrider Bikes range.
- 20" Wheels (Caliper Brakes)
- 6 Speed (1 x 6)
- Designed for MTB riding.
- Was available in M in Black.
- Weighs 12.4kg
Complete specification
Frame & Fork | |
Frame | Steel Rockrider hardtail children's frame for 20" wheels and V-Brakes |
Forks | Rockrider 20" Suspension fork |
Frame Material | Steel |
Frame Type | Hardtail |
Fork Type | Suspension Fork |
Wheels | |
Wheels | 20" Rockrider wheels with Quick Release on front wheel |
Tyres | MTB SkinWall 20" tyres (2 to 3.5 bars pressure). Includes 20" inner tube, with 1.7" to 2.2" Schrader valve. |
Wheel Diameter | 20" |
Controls | |
Handlebars | Combined Rockrider handlebar and stem for simplicity |
Stem | Combined Rockrider handlebar and stem unit |
Headset | Rockrider brand headset |
Grips | Rockrider kids grips |
Finishing Kit | |
Seatpost | 300mm Rockrider seatpost |
Saddle | Sporty design saddle, with plastic rear section |
Pedals | Rockrider Platform pedals |
Braking | |
Brakes | V-Brakes with Easy brake brake levers |
Brakes Type | Caliper Brakes |
Drivetrain | |
Chainset | 140mm crank with double chain guard |
Front Derailleur | n/a |
Rear Derailleur | 6 speed rear derailleur with steel protective guard |
Shifters | Rear grip shifter |
Chain | 6 speed steel chain |
Cassette | 6 speed cassette |
Number of Gears | 6 Speed |
Chainrings | Single Chainring |
Cassette | 6 Speed |
General Details | |
Other Info | This MTB is equipped with a bell, lighting, wheel reflectors and platform pedals. Lifetime warranty on frame, stem and handlebars |
Bike Type | Kids Bikes |
Range | Rockrider Bikes |
Weight | 12.4kg |
Designed for | MTB |
Colour | Black |
Size | M |
Brand | B'TWIN |
Retailer | Decathlon |
RRP | £169.99 |
Lowest Price | £169.99 |
B'Twin Rockrider ST 500 6-9 Kids MTB
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.
Ease of 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 tyres for less weight, with side knobs.
Cycling comfort: A saddle with a sporty design, sized especially for kids.
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: an easier, safer system as the child's hands stay on the handlebars.
This makes changing gears to match the terrain simple and easy! 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 section on the rear (a bumper) to protect against any impacts.
Crankset: The new chainset has a 140 mm crank that is designed for a child's leg length. This chainset allows you to start pedalling 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 tyres: The tyres are designed for mountain biking. The lateral lugs provide good grip on turns.
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 indicated on the side of the tyre (2 to 3.5 bars).
20" inner tube, 1.7" to 2.2" Schrader valve.
Bike accessories: This MTB is equipped with a bell, lighting, wheel reflectors and platform pedals.
Dimensions of the bike ready to use: Length: 140cm.
Height: 80cm.
Width: 54cm.
Frame dimensions: Top tube length: 431.6 mm.
Seat tube length: 285 mm.
Chainstay length: 360 mm.
Seat post length: 300 mm.
Head angle: 68.8 degrees .
Warranty: for life (frame, stem, handlebars, rigid fork). Find out more about this bike's warranty.
Weight: 12.4kg.
.. more details.
B'Twin Bikes
B'Twin are a popular choice of bike in the UK, partly due to their widespread distribution by Decathlon, and partly due to the value they offer. Their bikes are divided into several slightly overlapping ranges, with Triban best known for road and gravel bikes, and Rockrider gaining a reputation for high performing MTBs to suit every budget. Elops largely consist of a range of city bikes, whereas Riverside focus on hybrids. All in all, B'Twin bikes are well worth checking out given the size of their ranges; there's a model to suit most budgets.
Rockrider Mountain Bikes
Rockrider are Decathlon's off-road offerings, comprising of a series of kids bikes and adult hardtails, full suspension steeds and even a handful of high end E-MTBs.
This brand was launched in 2018, when Decathlon decided to split their B'Twin bikes into different genres. In terms of prices, there's something for everyone, with adult's MTBs starting at just over £200 and rising up to high end lightweight race bikes at nearly the £4000 mark.
If you want to ride off-road, and would prefer to buy from Decathlon, then the Rockrider mountain bike range is for you.
Rockrider ST 500 6-9 Kids MTB Specification | |
Bike Type | Kids Bikes |
Range | Rockrider Bikes |
Weight | 12.4kg |
Frame Material | Steel |
Frame Type | Hardtail |
Fork Type | Suspension Fork |
Brakes Type | Caliper Brakes |
Number of Gears | 6 Speed |
Chainrings | Single Chainring |
Number of Gears | 6 Speed |
Wheel Diameter | 20" |
Colour | Black |
Size | M |
Designed for | MTB |
Brand | B'TWIN |
Retailer | Decathlon |
RRP | £169.99 |
Lowest Price | £169.99 |
Where to buy the B’Twin Rockrider ST 500 20″ 6-9 Steel Kids Mountain Bike?
As far as I'm aware, this B'TWIN Rockrider ST 500 6-9 Kids MTB deal has expired.
You can see if I have any other suitable Kids Bikes.
This B'TWIN deal was originally found at Decathlon, costing £169.99 and was last updated on 12th August 2022.