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ROCKRIDER XC 900S Full Suspension Carbon Mountain Bike - 29"

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was £1,699.99 -%


This price includes a recycling fee for electrical equipment and batteries DecathlonDeeeTaxMentionAfterPrice / Since

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£1,699.99 -%
This price includes a recycling fee for electrical equipment and batteries DecathlonDeeeTaxMentionAfterPrice / Since

* From To

* Sales from to Until end of stock
* From and limited stock
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The carbon fibre frame on this full suspension 29er XC machine is fully designed and produced by our dedicated team of MTB experts at Rockrider. With a modern XC geometry, up to date SRAM Eagle GX 12s groupest, quality Mavic 29 inch wheels and 120mm travel Rockshox Reba forks this machine is ready to race and shred on your local trails. .
Not Available Now

We currently have limited capacity to build bikes in our warehouse. Due to this, we are limiting the number of bikes we sell per day and you might not be able to process your order at checkout. The count resets at 11pm every day so that would be the best time to try, although we do have a peak of attempts at this time so we can't guarantee a slot for everyone.

Product benefits

Efficiency Win: 12-speed SRAM GX Eagle, Mavic Crossmax (29") Tubeless Ready wheels.
Lightweight Give it your all: full suspension carbon frame, alu rear (frame: 2.2 kg in S)
Shock absorption Fork: 120mm ROCKSHOX REBA RL, 120mm Combo Lock 2 Radium Metric shock.
Braking power Enjoy powerful SRAM Level T dual-piston brakes with 160mm discs.

Technical Information


Entirely designed and developed in France at the B'Twin Village (Lille).
The ROCKRIDER team designed and tested this XC 900 S 29" mountain bike with the involvement of XC mountain bikers like our technical partner and professional mountain bike racer: Milton Ramos, winner of many XCM races around the world.
To better satisfy your needs, we assembled the Rockrider XC 900 S 29" at our own factory in Lille, just steps away from the bike design team.


Men's or women's mountain bike? This Rockrider XC 900 S 29" is unisex.
For greater comfort, women can replace the saddle with the 500 Women's Sport saddle that is adapted to women's bodies.


Several sizes available:
S: between 1.55 m and 1.64 m
M: between 1.65 m and 1.74 m
L: between 1.75m and 1.84 m
XL: between 1.85 m and 1.95 m
If you are on the edge between 2 sizes, we recommend following the exact size listed.


New FS Rockrider Cross Country 29" carbon frame.
ALU 6061/6013 rear triangle
Carbon rod
Specific geometry for 29" wheels
148mm x 12mm rear axle. BOOST
"Press fit 92" bottom bracket
31.6 mm diameter saddle tube and internal guidance to fit the telescoping seat post
Access hatch for easy bottom bracket maintenance
Compatible with 1 bottle cage.
Single chainring only
Weight in size S: 2.2 kg
Aluminium axles (light weight)


Make obstacles disappear.
ROCKSHOX REBA RL front suspension with 120mm of travel.
BOOST axle.
Direct lockout front suspension (3 positions) on the handlebars with the COMBOLOCK 2 grip.
3 modes: locked, medium, and open

ComboLock 2

This ROCKRIDER XC 900 S mountain bike is equipped with the new Combolock system: better ergonomics and easier to use. The contact surface is larger and integrates better with the grips.
A new smaller action angle for greater accuracy.


MANITOU Radium Expert Metric shock
Specific setting for XC 900 S
120mm travel, 190x45mm
3 lockout adjustment positions (compression damper)
Adjustable bounce


Ride anywhere, whether up or down hill with this 12-speed cassette.
SRAM GX EAGLE drivetrain, single 1x12 chainwheel, for larger metres of development and climbing more easily.
Chainwheel: SRAM Turativ STYLO 34 teeth to pick up more speed.
SRAM XG1275 EAGLE cassette with 12 cogs: 10 to 50 teeth. The 50-teeth cog ensures you get the right gear ratio for climbing the most challenging sections, whilst 10-teeth cog is ideal for developing the fastest speed.


Keep stable and find your attack position.
ROCKRIDER Comp Flat handlebar, 720 mm wide for better control of the 29" wheels
ROCKRIDER COMP stem adapted to the size (70mm in size M, 80mm in size L and 90mm in size XL).
Semi-integrated headset with sealed bearings.
New ROCKRIDER 900 Combolock grips for better integration. The Combolock lockout is lighter, and the "lock on" function has been added (attaches to the handlebars with a screw system).


The XC 900 mountain bike S is equipped with a 31.6 mm diameter seat post. The 400 mm length (350 mm in size S) allows a wide range of adjustment.
The new ROCKRIDER XC / AM saddle with Ergofit system provides comfort as you pedal. A reinforced area has been added (Cordura).
The saddle weighs 265g.


The choice of double hydraulic disc brakes for incisive braking.
Exclusive SRAM Level T hydraulic disc brakes.
Front 160mm disc, 160mm rear disc.


29" : Wheels up to the challenge of XC!
MAVIC Crossmax Tubeless Ready wheels in 15 mm at the front and 12 mm at the rear. BOOST
Inner rim width: 25 mm.
Tubeless Mavic rim strip.
UST valve included.
XD Pound Wheel
ETRTO Dimension: 622x25TSS
Sealed bearings.
Weight of both wheels without tyres: 1.930 kg


Grip and move over all types of terrain.
Hutchinson Skeleton TR 29x2.1 Tubeless Ready tyres
Low profile tyre, lightweight and high-performance, designed for rides on dry ground.
A tread that ensures greater performance.
Side lugs to provide maximum grip.


This ROCKRIDER XC900S MTB is fitted with our exclusive cyclometer mount:
This mount is compatible with Garmin or Sigma cyclometers/GPS which don't require additional fittings for your headset.


The bike is supplied with B'Twin Flat Pro platform pedals. However, for better performance when pedalling, we recommend replacing them with clipless pedals (not included).


The front and rear wheels attach and remove in 1 motion: you just need a hex key (size 6).
The rear derailleur has a screed that locks and unlocks easily to easily attach or remove the rear wheel.


11.9 kg in size S, without pedals.
12 kg in size M, without pedals.
12.1 kg in size L, without pedals.
12.2 kg in size XL, without pedals.
Weight measured with inner tube.
Weight can vary based on the tolerance of the components.
The complete bike (MTB + fully equipped rider) should not exceed 120kg.


During your first outings, the equipment on your bike will gradually adjust itself (chain, dérailleur, brakes, etc.).
We offer a free inspection in the 6 months following purchase, where our technicians will carry out a 13-point check of your bike.
Access all our advice on handling your bike:

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How has this product been built

Composition / advice

50.00% Carbon Fiber, 50.00% Aluminium 6061
Care instructions: Rinse in clean water after use.
Stock advice We recommend storing your mountain bike in a cool, dry place, away from corrosive products and salty air.
Legal notice The bike's weight can vary based on the tolerance of the components. Total weight (bike + equipped rider) should not exceed 120 kg.
How to choose your product

Our commitments

Milton Ramos, professional cross country mountain biker on the most demanding routes in the world, including the Iron Bike, Andalucia Bike Race, Hero Himalaya...
Test Product Please visit your local Decathlon store for any pre-purchase tests.
Guarantee : Warranty: 5 years for the frame, lifetime on the parts. Availability of spare parts: 2 years


Q : How to assemble your bike?
Everything you need to know about making sure your bike is comfortable, secure and ready to ride.
Q : How do you adjust your brakes?
Having properly functioning brakes is vital when out on the road. Check out how to get them working to your liking.
Q : How to replace a brake lever on a bike?
Having properly functioning brakes is vital when out on the road. Here’s a video to show you how to make sure your new brake level is working nicely.
Q : How to replace a disc brake?
Having issues with your disc brake? Then this video is for you.
Q : How to adjust your bike handlebar?
A suitable handlebar height is essential to your cycling safety and comfort. Find out how to adjust it to your liking with our video.
Q : Do you offer a Cycle To Work scheme?
Find out everything you need to know about way of getting to work that’s good you and the environment.Check Here

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Our services

XC 900S Full Suspension Carbon Mountain Bike - 29
Maintenance and repair
Maintenance and repair
Spare parts