29" Full-Suspencion All Mountain Bike - Grey/Blue


This 27.5" mountain bike has been designed and developed to best suit mountain bike rides lasting two to three hours, all year round, in any conditions.

This is a new model in our all-mountain AM 100 S full-suspension mountain bike range. The bike is geometry designed for steering, with 29" wheels for better speed and stability on your rides.

Size: size guide


Similar Products

Product benefits

Directional control

Directional control

Steering control: 66° head angle, short stem, low chainset, dropper seat post

Shock absorption

Shock absorption

New Rockshox 35 150mm fork, Manitou McLeod 140mm shock absorber

Braking power

Braking power

SRAM Level T 4 pistons/180mm front brake and 2 pistons/160mm rear brake



Hutchinson Tubeless Ready Taipan 29" x 2.35 and Toro 29" x 2.25 tyres

Technical information

Choosing your mountain bike size

Several sizes available:
S: 1.55 m to 1.64 m
M: between 1.65 m and 1.74 m
L: between 1.75 m and 1.84 m
XL: between 1.85 m and 1.95 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 higher performance).

The story of the 100S all-mountain bike...

This mountain bike was fully designed and developed at the B'Twin Village (Lille, France) and is the brainchild of an expert team of all-mountain bike enthusiasts.
The Rockrider team designed and tested this Rockrider AM100 S All-Mountain bike together with their MTB testers in the Vosges and the Alps.

The AM 100 S is assembled at our own factory in Lille, just steps away from the bike design team.


The ROCKRIDER ALL MOUNTAIN frame offers 140 mm of travel on the rear wheel.
Its geometry has been optimised for steering: 66° steering angle, 15 mm bottom bracket under the wheel axle.

Made of 6061 and 6013 aluminium.
Lifetime warranty on the Switch & Ride frame: compatible with 27.5" and 29" wheels.
148 mm x 12 mm BOOST rear axle.
Press Fit 92 bottom bracket.
31.6 mm diameter seat post.

Compatible with a bottle cage.
Weight in size S: 2.7 kg.

Front suspension

Rockshox 35 Gold fork with 150mm travel.
With new Burly 35mm damping rods for more stiffness and control, and a DebonAir™ pneumatic spring (which reduces rubbing), the shock absorption and response to loading are increased. Compatible with 27.5" and 29" wheels.

Rear suspension

Manitou McLeod Air 190X51 rear shock designed specifically for the Rockrider AM 100 S mountain bike.
Adjustable to reduce bobbing during long climbs on faster terrain.


SRAM NX drive train, 1x12 single chainwheel, for lighter weight, more precision, faster gear changing, and greater durability.

Rack: 34 teeth (for the 2020 model), 30 teeth (for the 2021 model), compatible with 30, 32, or 34 teeth chainrings, accessible without having to change the chain. Cassette: SRAM Eagle in 11-50 (11-13-15-17-19-22-25-28-32-36-42-50). The 50-tooth sprocket guarantees good gear reduction to help you climb the steepest slopes.

Riding position

Control your steering & stay precise.

Rockrider Comp Flat handlebars, 760mm wide for greater stability.
35 mm stem.

Semi-integrated headset with sealed bearings.
Lightweight Rockrider 900 "lock on" grips (attached to the handlebar with a screw-on system).


SRAM Level T brakes, with the 4-piston brake calipers designed to cope with the most demanding terrain, offering improved bite and modularity.180 mm front disc, 160 mm rear disc.

Saddle and seat post

The Rockrider XC/AM saddle has an Ergofit system for greater comfort while pedalling.
The height of the dropper seat post can be adjusted using the control on the bike's handlebar: 120mm of travel in size S/M and 150mm in L/XL. The ability to lower the saddle in a second with a single press of the thumb is a real advantage for all-mountain biking.
Feel at ease (and relaxed!) in your seating position on the bike during technical descents.


Sun Ringle Duroc 30 wheels, with Boost axles, 15 mm at the front and 12 mm at the back.
Outer rim width: 30 mm.Watertight bearings.

Equipped with a watertight rim strip that is Tubeless Ready.
To switch to tubeless: simply add a Tubeless valve and tyre sealant. The original tyres are already Tubeless Ready.


Hutchinson Taipan 29 x 2.25" and Toro 29 x 2.35" tyres.
A versatile tyre designed for riding on any type of terrain.
High side knobs for good grip in the turns.Tubeless Ready.


The bike is supplied with 520 Grip platform mountain biking pedals (ref: 8487130). However, for improved performance when pedalling and for better control of the bike when cycling, we recommend replacing them with clipless pedals with platforms or wide aluminium platform pedals.

A unisex mountain bike

Men's or women's mountain bike? This Rockrider AM 100 S mountain bike is unisex.
For a comfier ride, the women on our mountain bike team recommend narrower handlebars as this improves handling.

Transporting your bike

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.

Free service and after-sales website

During your first few rides, your bike's equipment will stretch and move (chain, derailleur, brakes, etc.)
We offer a free service within 6 months of your purchase. Our technicians will carry out a 13-point safety check of your bike. If you need help, please visit our Decathlon after-sales website.


S - 150-164 cm: 14.3kg
M - 165-174 cm: 14.4 kg
L - 175-184 cm: 14.6 kg
XL - 185-200 cm: 14.9 kg


Lifetime (frame, stem, handlebar). Details on our website. Availability of spare parts: 2 years.


S - 155-164cm : 14.3 kg
M - 165-174cm : 14.4 kg
L - 175-184cm : 14.6 kg
XL - 185-195cm : 14.9 kg
bike without pedals

Product concept & technology

Product Composition

Frame 100% Aluminium


We recommend storing your mountain bike in a cool, dry place, away from corrosive products and salty air.

User Directions

maximum rider weight: 100 kg


Ask your local Decathlon store about testing before purchase.

Approved By

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.

Maintenance advice

The equipment of your bike (transmission, brakes...) will adjust in the first months after purchase. Contact the workshop of your store for a complete review of your bike settings..


To have more informations about this product, consult the notice


29" Full-Suspencion All Mountain Bike - Grey/Blue
29" Full-Suspencion All Mountain Bike - Grey/Blue
29" Full-Suspencion All Mountain Bike - Grey/Blue
29" Full-Suspencion All Mountain Bike - Grey/Blue
29" Full-Suspencion All Mountain Bike - Grey/Blue
29" Full-Suspencion All Mountain Bike - Grey/Blue
29" Full-Suspencion All Mountain Bike - Grey/Blue


Q:How to assemble your bike?

A: Everything you need to know about making sure your bike is comfortable, secure and ready to ride.

Q:Do you offer a Cycle To Work scheme?

A: Find out everything you need to know about way of getting to work that’s for good you and the environment. Check Here
Products sold and shipped by Partners are not eligible for Cycle to work Schemes

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