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ROCKRIDER XC 100S Full Suspension Mountain Bike - 27.5+

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until £1,099.99 -%


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

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£1,099.99 -%
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 ideal bike for getting started with cross-country mountain biking, the Rockrider XC100S full-suspension mountain bike will help you to surpass your limits. Its key features include 27.5+-inch wheels for perfect handling during turns and accelerations, SRAM NX Eagle 1x12, SunRingle Duroc 30 wheels and a ‘Switch and Ride’ compatibility with three wheel sizes.
  • Aluminium frame with XC geometry
  • Suitable for both men and women
  • Lifetime warranty on frame, stem and handlebars
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. If you are unable to process your order at checkout, please return the following day to make your purchase.


Product benefits

Efficiency Go faster: XC-specific geometry, SRAM NX Eagle 1x12, SunRingle Duroc 40 wheels.
Lightweight Go faster with the full-suspension aluminium frame (2.58 kg in size S).
Shock absorption Read the terrain: 120 mm fork and shock, with new kinematics.
Braking power Powerful brakes with double piston callipers and 180 mm / 160 mm discs.

Technical Information


Designed and created entirely in France at the B'Twin Village (Lille), this mountain bike is the fruit of the labours of an expert team of passionate cross-country mountain bikers. The Rockrider team designed, created and tested this XC 100 S mountain bike with their mountain bike test team.
To better satisfy your needs, we assembled the Rockrider XC 100 S at our own factory in Lille, just steps away from the bike design team.
More information at:


The Switch & Ride system is easy. It consists of a mountain bike frame that's compatible with 3 wheel sizes.
1 / Choose your Switch & Ride compatible MTB in size 27.5 ", 27.5" PLUS, or 29".
2 / Add a second or third pair of wheels.
3 / Enjoy riding your bike on any terrain!


Men's or women's mountain bike?
This Rockrider XC 100 S is unisex.
For greater comfort, the women on our mountain bike team recommend replacing the stock saddle with the Women's 500 Sport saddle, which is adapted to the female form.


Comes in several sizes:
S: between 1.50 m and 1.64 m
XL: 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 your height is on the cusp of the 2 sizes, we recommend the bike that matches your height exactly.


This Rockrider Cross Country frame offers 120 mm of travel on the rear wheel. Its geometry has been optimised for performance, with a 69.5° steering angle.
Made of 6061 and 6013 aluminium.
Switch & Ride compatible frame with a lifetime warranty: Compatible with 29" and 27.5" wheels. Boost 148 mm x 12 mm rear axle.
Press Fit 92 bottom bracket.
Seat tube has a 31.6 mm diameter and can take a telescoping seat post.
Can hold a bottle cage.
Weight in size S: 2.58 kg


Make obstacles disappear.
Manitou Markhor front suspension with 120 mm of travel, with an adjustment mechanism made exclusively for the XC 100 S.
Hydraulic suspension is both sensitive to small impacts (absorbs the slightest bump at low speeds), and handles bigger shocks well (absorbs large obstacles at high speeds).
Front suspension with handlebar lockout (in intermediate or locked position) using the Combo Lock handle.
Suspension compatible with 29" and 27.5" wheels.


Easily adjust your riding path and keep up your speed, especially in technical sections.
Manitou Radium Expert rear suspension with 120 mm travel, specifically updated for the Rockrider XC 100 S mountain bike.
Rear suspension with handlebar lockout (in intermediate or fully locked position) using the Combo Lock handle, which locks the front and rear suspensions simultaneously.


The single-chainring drivetrain helps you stay focused on your ride.
New SRAM NX Eagle drivetrain with a single 12-speed chainring for less weight, more precision, faster gear changing, and greater durability.
The 34-tooth chainring can be easily replaced with one ranging from 28 to 34 teeth.
SRAM PG1230 cassette with 12 cogs: 11, 13, 15, 17, 19, 22, 25, 28, 32, 36, 42, 50 teeth. The 50-tooth cog provides an ideal ratio for climbing the most challenging sections.
Full single-chainring system


Keep stable and find your attack position.
The Rockrider Comp Flat handlebar is 720 mm wide for more stability.
B'Twin Comp stem, resized for each frame size (70 mm in size S, 80 mm in size M, 90 mm in size L, and 100 mm in size XL).
Semi-integrated headset with sealed bearings.
Lightweight, "lock on" style Rockrider 900 grips that screw onto the handlebar.


Enjoy greater comfort when pedalling.
The ROCKRIDER XC / AM saddle weighs 265 g. Reinforcements plus the Ergofit system for added comfort. The seat post is 31.6 x 400 to allow compatibility with telescopic posts.


Fitted with brakes that are both powerful and progressive.
Exclusive Rockrider by Tektro double-piston brakes.
180 mm disc front brakes, 160 mm disc rear brakes.


27.5" Plus Switch & Ride: choose power and control!
Sun Ringle Duroc 30 SRC Tubeless Ready wheels, with Boost axles, 15 mm at the front and 12 mm at the rear.
Inner rim width: 30 mm.
Sealed bearings.
Equipped with a watertight rim strip that is Tubeless Ready compatible.
To switch to Tubeless Ready: Add a Tubeless valve and tyre sealant, and replace the original tyre with the Tubeless Ready version of the same model (available in Decathlon stores).


Grip and move on all types of terrain.
Hutchinson Toro 2 tyres size 27.5 x 2.25. Versatile tyres designed for riding on all types of terrain, smooth, rocky, dry, muddy, etc. More lugs to increase riding performance.
High side lugs provide good grip in turns.


The bike comes with B'Twin Flat Evo platform pedals. However, for better pedalling performance, we recommend replacing them with platform 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.


13.9 kg in size S, without pedals.
14 kg in size M, without pedals.
14.1 kg in size L, without pedals.
14.2 kg in size XL, without pedals.
Weight can vary based on the tolerance of the components. The bike comes with B'Twin Flat Evo platform pedals.
Total weight (bike + equipped rider) should not exceed 120 kg.


Your Rockrider XC 100 S mountain bike is Switch & Ride compatible. It is compatible with 3 different wheel sizes: 27.5", 29" and 27.5" PLUS.
Enjoy a range of difference experiences using the same frame and components! With the 3 different ready-to-ride wheel kits, available in Decathlon stores, one bike becomes three bikes with three different experiences!


Your bike's components (chain, derailleur, brakes, etc.) will adjust during your first few rides. We offer free servicing for the first 6 months following your purchase, during which time our technicians will perform a 13-point inspection of your bike.
Check out our tips on handling your bike:

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Composition / advice

Frame (for bike)
100.00% Aluminium
Stock advice We recommend storing your mountain bike in a cool, dry place, away from corrosive products or salty air.
instructions To get more information about this product, please read instructions

Our commitments

Test Product Visit your local Decathlon store if you'd like to try it out before making your purchase.
Guarantee : Lifetime (frame, stem, handlebar). See details on our website. Spare parts: 2 years.

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XC 100S Full Suspension Mountain Bike - 27.5+
Maintenance and repair
Maintenance and repair
Spare parts