Compare bikes: Compare Btwin Rockrider ST 900 (2020) vs. Rockrider 27.5" ST 520 V2 (2020) - Findabike

The new aluminium chainset has a 152 mm crank that is suited to the child's leg length. This light chainset allows you to start pedalling more easily.The double guard over the chain stops it jumping.

3 x 8 speeds, 24 speeds total!2 shifters on the handlebar.Left (chainrings): control ascents/descents.Right (speeds): more precise control over your pedalling.In detail:-ROCKRIDER FC ATB 500 triple chainring - 22/32/42 teeth-SHIMANO ALTUS front derailleur-MICROSHIFT RD-M46-L rear derailleur-MICROSHIFT TS39 shifters-SHIMANO 8-speed cassette (11-32 teeth)-KMC Z7 wide and sturdy chain

Our engineers have designed a new aluminium frame. Durable, lightweight and responsive: designed for tackling any obstacles when out mountain biking. - Top tube length: 479.3 mmSeat tube length: 345 mmChainstay length: 415 mmSeat post length: 370 mmHead angle: 68.2°

With a heavily sloped top tube and a wide range of sizes (from S: 1.50 m to XL: 2.00 m).The ST 520 mountain bike frame is UNISEX.The ST 520 mountain bike is available with the same frame in a WOMEN'S version: fitted seat, narrower handlebar, 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 fitted to the female form. - Our designers created a frame that's easy to get onto.The CGF frame (Comfort Geometry Frame) EVO is made of 100% aluminium for greater comfort. Its slope was carefully designed to keep your back straighter.

Take on new challenging terrain (roots, stones, gravel, etc.) with ease thanks to the travel of the front suspension fork. Suntour fork with 50 mm of travel.

front: The 80 mm front suspension helps you get started with overcoming obstacles on slightly uneven trails easily.Easily adjust the hardness using U-Fit technology (weight adjuster). Simply set the number to your weight using the dial on the fork. - rear: This mountain bike has no rear suspension. It is a "semi-stiff" mountain bike: perfect for beginners getting started with their first mountain bike rides. Compared to a full suspension mountain bike (with rear suspension), it has the following advantages: the bike is lighter; you can pedal faster on flatter ground.

The double-walled aluminium rims are light and durable.For transporting the bike, we've made it easy to attach/detach the front and rear wheels. They are equipped with a quick-release system.The tyres use SkinWall technology. This process allows you to reduce their weight, therefore increasing performance, grip and comfort.24-inch 1.7 to 2.2 cross-section inner tube with Schrader valve. Pressure indicated on the tyre sidewall (between 2 and 3.5 bar).

The 27.5" wheels of the ST 520 are tolerant and sturdy, with 19 mm double-walled rims with 28 spokes. Fearlessly get started with riding over obstacles, small rocks, roots, holes and bumps!Because your first rides will be on dry terrain, the DRY 27.5 x 2.0 tyres are the most suitable. They have higher performance thanks to a smooth and fast central section, whilst the side lugs provide good grip on turns.

Brake effectively thanks to the mechanical disc brakes at the front and rear.The disc brake acts on the wheel axle to deliver powerful braking under any conditions (dry, wet, muddy, etc.).

The Tektro TKD 68 160 mm double disc brakes provide powerful, progressive braking at the front and rear. The aluminium Tektro brake levers are light, precise, and easy to hold. You can brake with just two fingers.We recommend that you have your brakes checked at least once a year.

The adjustable stem on the ST 520 S allows you to position the levers so they're easy to grip. The all-aluminium ROCKRIDER stem is 70 mm (size S), 80 mm (size M/L), or 90 mm (size XL) and can be raised in 5 adjustment intervals: + 0 mm, + 7.5 mm, + 15 mm, + 22.5 mm, + 30 mm.In detail:- 680 mm oversize ROCKRIDER SPORT aluminium handlebar- ROCKRIDER SPORT "soft touch" ergonomic grips for good grip and a comfortable feel.

The ST 520 saddle is welded to prevent any saddle movement as you cycle.Because your comfort is our top priority after your safety, we've added an exclusive Rockrider Ergofit saddle that is wider and hammock shaped.Easily adjust the height of your saddle with the Flex steel seat post (either 350 mm or 400 mm long, depending according to the bike size). Its reduced diameter (27.2 mm) provides your seat with natural flexibility, 30% more than a standard solution.

The Rockrider ST 520 mountain bike comes with flat mountain bike pedals made from hard resin for lighter weight and greater safety.If your feet can slide off the pedals when needed, there's less risk of injury.The pedals on the ST 520 are compatible with toe clips.