Compare bikes: Compare Btwin Rockrider ST 500 Kids (2020) vs. Rockrider 27.5" ST 100 (2020) - Findabike

The new chainset has a 152 mm crank that is adapted to the length of your child's leg. This chainset allows you to start pedalling more easily. The crank is covered with a guard to stop you coming into contact with the metal part.

3 x 7 speed chainwheels, 21 speeds total!2 easy-to-use grip shifters on the handlebars.Left (chainwheels): control ascents/descents.Right (speeds): more precise control over your pedalling.In detail:-Triple-chainwheel chainset (22/32/42 teeth)+ anti-grease protection.-Microshift FD-M20 front derailleur-Microshift RD-M25 rear derailleur-Microshift MS25 grip shifters with speed indicators-Shimano TZ500 7 cog cassette, 14 to 28 teeth-Large, solid KMC Z51 chain

Our engineers have designed a new sturdy steel frame. The frame's rear chainstays are short, making the bike responsive and easy to handle. - Top tube length: 478.6 mmSeat tube length: 345 mmChainstay length: 415 mmSeat post length: 300 mmHead angle: 68.2°

With a very marked slope on the top tube and a wide range of sizes (from XS:1.45m to XL:2.00m),The ST 100 mountain bike frame is UNISEX.The ST 100 mountain bike exists with the same frame in a WOMEN'S version: adapted seat, narrower handlebars, shorter stem, fork with a more flexible spring, and brake levers that are closer together.As a WOMAN, if you choose the MEN'S model, we recommend at least purchasing the WOMEN'S SPORT 500 saddle which is adapted to women's body types. - It isn't always easy to get the right position on a mountain bike. Our designers have created an entirely new frame that is easy to step over.The 100% aluminium CGF frame (Comfort Geometry Frame) is both comfortable and easy to handle. The slope angle has been designed to keep your back straighter whilst the rear has been shortened to ensure the bike is very agile when turning.

Take on new challenging terrain (roots, stones, gravel, etc.) with ease thanks to the travel of the front suspension fork.

front: The 80 mm front suspension helps you overcome your first obstacles on slightly uneven trails with no worries.Its mechanical spring is a stamp of reliability. And the fork is particularly easy to maintain.To adjust the stiffness? It's very easy using a single dial. - rear: This mountain bike has no rear suspension.It is a "hardtail" mountain bike: perfect for beginners launching themselves into their first mountain bike touring rides.Compared to a full suspension mountain bike (with rear suspension), the advantages are clear: the mountain bike is lighter; you expend less energy on flat ground.

To transport the bike, we’ve made it easy to remove and attach the front wheel. It is equipped with a quick-release system.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 displayed on the tyre sidewall (between 2 and 3.5 bar).24-inch 1.7 to 2.2 cross-section inner tube with Schrader valve.

The wheels of the ST 100 are tolerant and robust, with 27.5" double-walled 28-spoke rims (26" for the XS size). Slow down without worrying about obstacles: small rocks, cracks, holes and bumps!Because your first rides will be on dry ground, this mountain bike is equipped with DRY 27.5 x 2.0 tyres. Their performance has been optimised thanks to a faster central section, while their side lugs offer excellent traction in turns.

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.

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.Thanks to the special design of the ST 100's aluminium brake levers, you only need two fingers to brake.

With a stem that tilts 10° upwards, the riding position of the ST 100 is raised, accessible, and comfortable.In detail:- 90mm (in sizes XS and S) or 110mm (in sizes M, L and XL) aluminium stem with an angle of 10° for maximum comfort- 620mm-wide steel handlebar, for stability and control-"Soft touch" grips for a firm yet soft and pleasant grasp.

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.

The saddle of the ST 100 is welded to prevent any movement of the saddle.And because your comfort is our next priority after safety, we've added an exclusive wider Ergofit saddle with a hammock shape.Easily adjust the height of your saddle with the Flex steel seat post, either 350mm or 400mm long (according to the bike size). Its reduced diameter of 27.2mm provides your seat with natural flexibility, 30% more than a standard solution.

The Rockrider ST 100 mountain bike is supplied with hard resin platform mountain bike pedals for added lightness and safety.If your foot slides on the pedal, there's less risk of injury.