ROCKRIDER

CHILDREN'S MOUNTAIN BIKE ROCKRIDER ST 900 20 INCH 6-9 years RED

329.90
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Ref. : 8405038

We've designed this all-terrain bike for children aged 6 to 9 (120 to 135 cm) who want to improve their mountain biking skills.

We've equipped this 20-inch mountain bike with a suspension fork to make it easy to tackle obstacles on rough terrain. The aluminum frame is strong, light and dynamic.

Color : bright red

20"

In-store collection

PRODUCT BENEFITS

Ease of use

Lightweight ALU frame and crankset. 6-speed twistgrip.

Brake control

Front mechanical disc brakes: powerful braking in all conditions.

Yield

Suspension fork. Lightweight Skinwall tires with side studs.

Steering comfort

Sport saddle with aluminum seatpost for added comfort.

TECHNICAL INFORMATION

Practice-friendly setting

Our engineers have designed a new aluminum frame. Strong, light and dynamic, it's perfect for overcoming any obstacle on your mountain bike outings.

Master braking

Brake effectively with the V-brake at the rear and the mechanical disc brake at the front.
The disc brake acts on the wheel axle to deliver powerful braking in all conditions (dry, wet, muddy...).
The V-brake is made up of 2 calipers fitted with pads that apply varying degrees of pressure to the rim to slow or stop wheel rotation.

Front suspension to cushion the terrain

Tackle new obstacles (roots, stones, rocks, etc.) with complete peace of mind, thanks to the front fork's long travel.

6-speed gear change

This bike is equipped with a twistgrip for shifting the 6 gears: an easier and safer system, as the child never lets go of the handlebars.
Changing gears to adapt to the terrain becomes a breeze!

Why have we created a brake lever adapted to the child's hand?

Because children's hands are smaller than adults', it's not easy for them to grasp the brake lever. That's why our engineers and designers have designed
to be closer to the handlebars, making it easier for them to grab the brake lever.

An ergonomic, reinforced saddle

A saddle with a sporty design, designed by us to adapt to children's morphology. Combined with a strong, flexible aluminum seatpost, it provides even greater comfort.

Pilot station

To fine-tune your riding, we've fitted this mountain bike with a short (60mm) aluminum stem and 520 mm "Oversize" handlebars. This means you'll be more precise and livelier in your turns.

Aluminium crankset

The new aluminum crankset has a crank length of 140 mm which is adapted to the child's leg length. This lightweight crankset makes it easier to start pedaling.
The double chain guard prevents the chain from derailing.

20" wheels and SkinWall MTB tires

The tires are suitable for off-road cycling. Lateral studs provide good grip in bends. The tires use SkinWall technology. This process reduces the weight of the tires and provides greater flexibility, improving performance, grip and comfort.

The recommended tire pressure is indicated on the tire sidewall (between 2 and 3.5 bar).

20-inch inner tube section 1.7 to 2.2, schrader valve.

Bicycle equipment

This mountain bike is equipped with a bell, lights, wheel reflectors and flat pedals.

The frame is also compatible with other B'TWIN accessories:
- front and rear mudguards
- kickstand
- bottle cage
- bike bag
- stabilizers: https://www.decathlon.fr/p/stabilisateurs-velo-enfant-20-24-btwin/_/R-p-302106?mc=8550741&c=NOIR

Ready-to-ride bike dimensions

Length: 140 cm.
Height: 80 cm.
Width: 54 cm.

What if I order online?

To guarantee quality transport, our bikes are sent with pedals disassembled and handlebars unclamped (instructions and tools supplied).

Frame dimensions

Top tube length: 433.4 mm
Seat tube length: 285 mm
Rear chainstay length: 360 mm
Seat post length: 300 mm
Headset angle: 69°.

Washing advice

To avoid damaging your bike, we advise against using a high-pressure cleaner. Instead, rinse with clear water and a sponge.

Non-contractual photos

Due to the health context, some photos are not contractual. The derailleur guard is not supplied with the bike, and the stem has only a spacer for height adjustment.

Warranty

for life (frame, stem, handlebars, rigid fork). Find out more about our bike warranty.

Weight

10.5 kg

COMPOSITIONS / ADVICE

Composition

100% Aluminium frame

STOCK TIPS

Keep the bike in a clean, dry place. Clean and lubricate the chain regularly. Our advice before every ride: inflate tires to the pressure indicated on the sidewall.

Restrictions

Helmet recommended. Maximum weight in use 80 kg

Terms of use

https://cdn.decathlon-share.com/product-user-guide/620278fb514df/world-usg-multilingual-bike-manual.pdf

USER REVIEWS

Questions & answers

See also