Btwin Rockrider ST100 24 inch - Review

by Simon Ananda Raj June 11, 2025 1 min read

The 24-inch Rockrider ST100 from Decathlon is designed for children aged between 8–12 years who are transitioning from basic riding to light trail adventures. With its robust frame, trail-ready design, and simplified drivetrain, the ST100 offers a perfect platform for young riders to build confidence, control, and endurance on mixed terrain. It strikes a balance between simplicity and performance, making it an ideal option for leisure rides, school commutes, and weekend family trail rides.

Simon Ananda Raj

: The frame of the ST100 is crafted using high-tensile steel, making it exceptionally durable to withstand the rough handling typically expected from young riders. This frame’s geometry is youth-specific—tailored for 8 to 12-year-olds with a height range of approximately 135 to 150 cm. The design ensures that the rider is seated in an upright position, promoting better control and comfort on longer rides.
The low top-tube makes mounting and dismounting easier for kids, while the balanced wheelbase contributes to stability even on uneven terrain.

Its overall build gives a reassuringly solid feel, which is important for beginners pushing their limits
: The drivetrain features a 1x7-speed B'Twin system, which simplifies gear shifting and helps children focus on riding rather than worrying about which gear to choose. This configuration avoids the confusion of multiple front chainrings and ensures maintenance remains low.
The thumb shifter is ergonomically designed for smaller hands and allows easy gear changes. Whether it's a mild uphill stretch or a flat pathway, the 7-speed range offers enough variety for young riders to adapt to changing gradients without overwhelming them.

Performance-wise, the bike responds well to pedaling effort and gives a smooth transition between gears
: Comfort is a clear priority in the ST100’s design. The rigid fork might not offer suspension, but that’s intentional—it reduces weight and simplifies handling. Most importantly, it allows better energy transfer while riding on paved and moderately uneven trails, which is where most young riders will spend their time.
The wide, padded saddle is designed to support growing riders over longer rides. The slightly swept-back handlebar design also adds to the relaxed posture, reducing stress on the shoulders and wrists.

The inclusion of adjustable seat height ensures that the bike can grow with the child, extending usability
: Equipped with V-brakes, the ST100 provides sufficient stopping power for its intended use. The levers are kid-sized, ensuring a firm grip and quick response. The braking system is responsive, predictable, and engages well even when applied with minimal force—perfect for riders still learning braking finesse.
The steering is light and accurate, thanks to the rigid fork and balanced geometry. Turning in tight spots or negotiating mild trails feels intuitive and safe.

The slightly raised handlebar position improves control, which is particularly beneficial for beginners still mastering balance and coordination
: The 24-inch wheels come with all-terrain tires that feature a medium tread pattern. These tires offer a good mix of grip and rolling efficiency, making them suitable for both paved surfaces and light off-road conditions like gravel paths, parks, and dirt trails.
The wheels themselves are sturdy and built to handle everyday use without easily going out of true.

The saddle is well-padded and broad, offering ample support for the lower back. It's ideal for kids who are gradually increasing the duration and distance of their rides

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Quote
: The Rockrider ST100 24-inch bicycle is a thoughtfully designed kids' cycle that delivers on all fronts—durability, ease of use, comfort, and performance. It’s an excellent choice for young riders who are looking to explore beyond the neighborhood and begin trail riding in a safe and controlled manner.
While it lacks suspension, this is a purposeful omission that favors simplicity and efficiency. Its sturdy build, effective braking system, and ergonomic fit make it a reliable partner for a child’s next stage of cycling development. Whether it’s for the school run or a forest trail, this bike is built to deliver a smooth, confident, and enjoyable riding experience.

Rockrider ST100 24 inch

Technical Specifications

Frame

Steel frame

Fork

front suspension fork.

Front Derailleur

N/A

Rear Derailleur

N/A
Shifters

N/A

Brakes

Vbrakes

Brake Levers

N/A

Tires

MTB tyres
Rims

N/A

Handlebar

N/A

Stem

N/A

Seatpost

Rigid
Saddle

N/A

Pedals

N/A

Hubs

N/A

Cassette

N/A
Chain

N/A

Crankset

N/A

Bottom Bracket

N/A

No of Gears

7 Speed
Riding Purpose

Leisure