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  • 15 - Cycling Cycling - ST 900 Full Suspension Mountain Bike - 27.5
  • 15 - Cycling Cycling - ST 900 Full Suspension Mountain Bike - 27.5
  • 15 - Cycling Cycling - ST 900 Full Suspension Mountain Bike - 27.5
  • 15 - Cycling Cycling - ST 900 Full Suspension Mountain Bike - 27.5
  • 15 - Cycling Cycling - ST 900 Full Suspension Mountain Bike - 27.5
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15 - Cycling

ROCKRIDER ST 900 Full Suspension Mountain Bike - 27.5"

ROCKRIDER
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Decathlon
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The ST 900 is a great full suss MTB designed with the more adventurous trail rider in mind. This machine focuses on comfort and control. With it's exclusive lifetime warranty double butted 6061 FS alloy frame it really is built to last. It features double walled 27.5" rims and smooth running sealed bearing hubs, lockable 120mm travel Rockshox 30 Silver Air front forks and a 120 mm X-FUSION O2 PRO L air rear shock. Equipped with up to date 1x11 gearing and tektro designed hydraulic disc brakes. The wider bars, hammock saddle and 2.2 wide tyres complete this fine package. Available in 3 sizes: S, M and L Weight: 13.6kg
 

PRODUCT BENEFITS

Cycling comfort Enjoy the raised position, adjustable stem, 120mm suspension and hammock saddle
Efficiency Smooth riding: lighter wheels, single chainring and suspension lockout.
Directional control Manage your path: hydraulic fork and brakes, air shock.
Ease of use Change your speed or lock your fork in one motion on the handlebar.
Lifetime warranty Rockrider provides a lifetime guarantee for the frame, stem and handlebars.

TECHNICAL INFORMATION

WHAT OUR TEAM HAS TO SAY

Our passionate MTB team has fully designed and developed the ST 900 S mountain bike at the B'Twin Village in France (Lille). A comfortable, efficient mountain bike: 120 mm ROCKSHOX fork and air shock to easily overcome obstacles, single chainring and 27.5" double-walled wheels that have been lightened for efficiency.
We've involved mountain bikers at every stage of the design process.
And we hope that the Rockrider ST 900 S helps you make the most of your MTB tours.

A UNISEX MOUNTAIN BIKE

Men's or women's mountain bike?
This Rockrider ST 900 S is unisex.
For greater comfort, the women on our mountain bike team recommend replacing the saddle with the Women's 500 Sport saddle, which is adapted to women's bodies.

HOW TO CHOOSE YOUR ST 900 S MOUNTAIN BIKE SIZE

Several sizes available:
M: between 1.65m and 1.74m
L: between 1.75m and 1.84m
XL: between 1.85 m and 2.00 m
If you are on the limit between 2 sizes:
Choose the smaller size for easier steering (easier to handle) and comfort (straighter back).
Choose the larger size for easier pedalling with a more stretched-out position (position more suited to performance).

A LIGHT, COMFORTABLE, PLAYFUL FRAME

For less weight and more efficient pedalling, the Rockrider ST 900 S frame has been designed with 6061 aluminium (only 2.5 kg in size M without suspension). It is 200g lighter than the ST 540 S frame thanks to its double butted front triangle.
Its 120mm rear shock uses a single-pivot system (more sensitive to small impacts, while remaining firm in the face of large impacts) and sealed bearings for a great lifespan.

ROCKSHOX FRONT SUSPENSION

The 120 mm Rockshox 30 Silver Air hydraulic air fork is 400g lighter than that of the ST 540 bike. It is conical and offers even more stiffness and precision when steering.
Easily adjust the bounce and stiffness of the fork. Its quick COMBO LOCK lockout system, which you control from the handlebar, helps to prevent bobbing and loss of speed on smooth sections.

REAR AIR SHOCK

This bike has a light 120 mm X-FUSION O2 PRO L air shock that has been specially adapted to fit this frame. You can easily adjust it based on your weight using the Schrader valve.
A specific "high pressure" pump is required to adjust this shock (Rockrider suspension pump - ref: 3310286).
Its COMBO LOCK lockout system, which you control from the handlebar, helps to prevent bobbing and loss of speed on smooth sections.

DERAILLEUR & DRIVETRAIN: A SINGLE CHAINRING LIKE THE PROS!

The single chainring is easy and efficient to use.
1 chainring and 11 speeds: accelerate on the flat and take on climbs with no compromise.
1 single shifter on the handlebar: adapt your speed instantly like the pros as the terrain changes!
In detail:
-SRAM X1000 32-tooth single chainring
-MICROSHIFT M665 11-speed rear derailleur
-MICROSHIFT M8515 right shifter
-MICROSHIFT H113 11-cog 11 to 46 teeth cassette
-KMC X11 chain

HANDLEBARS, STEM, GRIPS

The controls of the ST 900 S fall straight under your hands thanks to the adjustable stem. The all-aluminium ROCKRIDER stem is 70 mm (size S), 80 mm (size M/L), or 90 mm (size XL) and can be raised using 5 adjustment intervals: + 0mm, + 7.5mm, + 15mm, + 22.5mm, + 30mm.
Details:
- 720mm oversized ROCKRIDER SPORT aluminium handlebars
- ROCKRIDER ergonomic grips for good grip and a comfortable feel.

COMFORTABLE, SPORT SEAT POST AND SADDLE

Our teams have conceived and designed an exclusive ROCKRIDER ERGOFIT Pro saddle. Designed for all hip widths, its hammock shape is very comfortable for long sports rides. Aluminium Rockrider Sport seat post combining lightness with plenty of adjustment, with a 31.6 mm diameter and 400 mm long.
Quick and easy tool-free adjustment of your saddle height using the adjustment lever on the seat post clamp.

HYDRAULIC DISC BRAKES

No matter what conditions you ride in (dry/wet), the Rockrider by Tektro 180 mm (front) and 160 mm (back) double hydraulic disc brakes will come through for you, even in the mud.
Hydraulic braking adds more power and progressive braking and requires less powerful use of the brake levers.
The aluminium brake levers are easy to grip, lightweight, and precise.

WIDE, LIGHT 27.5" WHEELS

The 27.5" wheels are lightened with double walls. Their sleeved rims, combined with the lightened tyres, are 230g lighter than on the ST 540.
With their 28 spokes, they are lightweight, stiff, and durable.
The exclusive ROCKRIDER ALL CONDITIONS LIGHT 27.5"x2.2 tyres have side knobs for all terrains. A width of 2.2 means more grip on technical sections.
Tubeless Ready rims: you will need rim tape, specific valves and sealant.

FLAT PEDALS

The ST 900 S is supplied with Rockrider Flat platform pedals with a wider pedalling surface and more pronounced dots for better grip on the pedal.

EASILY TRANSPORT AND STORE YOUR MOUNTAIN BIKE

Not all rides start on your doorstep. This is why we've made it easy to remove and attach the front and rear wheels. They are equipped with a quick-release system.A bike carrier will make your life easier if you want to avoid dirtying your car.

ACCESSORIES

Your ST 900 mountain bike is supplied with a bell, lights, wheel reflectors and pedals.
The frame is compatible with:
-front and rear mudguards
-bottle cage
-saddle bag
...
An exclusive interface placed on the stem lets you quickly attach the 120 and 500 Decathlon cyclometers, as well as Garmin, Sigma and Bryton cyclometers and GPS

COMFORT & SAFETY

On your first few rides, the equipment on your bike may shift a little (chain, derailleur, brakes, etc.). We offer a free inspection in the 6 months following purchase. Our technicians will carry out a 13-point check of your bike. Visit your nearest Decathlon workshop and our after-sales website:
https://support.decathlon.fr/

Weight

M - 165-174cm: 13.4 kg
L - 175-184cm: 13.5 kg
XL - 185-200cm: 13.6 kg
Weight without pedals

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COMPOSITION / ADVICE

Composition
Frame (for bike)
100.00% Aluminium 6061
Stock advice After washing, rub with a dry cloth to remove all traces of moisture. Store your mountain bike in a cool, dry place, away from corrosive products and salty air.
Restricted use : Not suitable for XC, All Mountain, Enduro and BMX.
Legal notice Your bike's weight may vary due to tolerances in the components. To make your wheels last longer, we recommend not exceeding the maximum weight of 120kg (rider with mountain bike).

OUR COMMITMENTS

Test Product Our engineers always have real riders test all our products in real conditions. These tests round out our lab tests and let us validate all our products before they hit store shelves.
Guarantee : Lifetime (frame, stem, handlebars). Availability of spare parts: 2 years.
 

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ST 900 Full Suspension Mountain Bike - 27.5
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