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Rockrider AM 100 S Mountain Bike 27.5"

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Model: 8551325

Product Features

A photo of the Rockrider AM 100 S Mountain Bike 27.5" in use

Rockrider AM 100 S Mountain Bike 27.5" is designed for

Enjoy a full suspension all-mountain mountain bike: geometry for intense steering and 27.5" wheels for better maneuverability and propulsion. Compatible with 3 wheel sizes (27.5", 29" and 27.5" PLUS).

Shock absorption

In just one motion, simultaneously lock out the 140 mm of front and rear travel.

Braking power

Powerful and progressive brakes: double piston calipers, 180 mm/160 mm discs

Lifetime warranty

ROCKRIDER offers a lifetime warranty on the frame, handlebars and stem.

Product Lifestyle Image Gallery

Image Gallery

Rockrider AM 100 S Mountain Bike 27.5 

Rockrider AM 100 S Mountain Bike 27.5 

Rockrider AM 100 S Mountain Bike 27.5 

Rockrider AM 100 S Mountain Bike 27.5 

Rockrider AM 100 S Mountain Bike 27.5 

Rockrider AM 100 S Mountain Bike 27.5 

Rockrider AM 100 S Mountain Bike 27.5 

Rockrider AM 100 S Mountain Bike 27.5 

Rockrider AM 100 S Mountain Bike 27.5 

Rockrider AM 100 S Mountain Bike 27.5

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Size Guide

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Additional Product Information


Bike frame

  • 100% Aluminum

The story of the 100 s am mountain bike...

Entirely designed and developed in France at the B'Twin Village (Lille), this mountain bike is the fruit of the work of an expert team of passionate all mountain bikers. The Rockrider team designed and tested the Rockrider 100 S all-mountain bike with their mountain bike testers.

Switch and ride: 1 bike, many rides

The SWITCH and RIDE system is easy: a mountain bike frame compatible with 3 wheel sizes. 1/ You choose your SWITCH AND RIDE compatible mountain bike in 27.5", 27.5" PLUS, or 29". 2/ You add a 2nd or 3rd pair of wheels. 3/ Enjoy all terrains!

A unisex mountain bike

Men's or women's mountain bike? The Rockrider 100 S AM mountain bike is unisex. For greater comfort, the women on our mountain bike team recommend the Women's 500 Sport saddle, which is adapted to women's bodies.

Choosing your mountain bike size

Several sizes available: S: between 5' and 5'5" M: between 5'5" and 5'9" L: between 5'9" and 6'0" 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 pedaling with a more stretched-out position (position more suited to performance).


The ROCKRIDER ALL MOUNTAIN frame offers 140 mm of travel on the rear wheel. Its geometry has been optimized for performance: steering angle at 68°, bottom bracket 15 mm under the wheel axle. Made of 6061 and 6013 aluminum. Switch And Ride frame with lifetime warranty: compatible with 29" and 27.5" PLUS wheels 5.8" 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: 6 lbs.

Front suspension

Have fun on technical terrain! Manitou Machette AIR front suspension with 140 mm of travel, specific to the ROCKRIDER 100 S AM mountain bike. Hydraulic suspension is both sensitive to small impacts (absorbs the slightest bump at low speed) and takes shocks well (absorbs large obstacles at high speed). Direct locking front suspension (in intermediate position or locked) on the handlebar using the COMBO LOCK handle. Suspension compatible with 29" and 27.5" PLUS wheels.

Rear suspension

Easily adjust to your weight and lock it to the handlebars. Manitou Mac Leod AIR rear suspension, specifically perfected for the ROCKRIDER 100 S AM mountain bike. Direct locking rear suspension (in intermediate position or locked) on the handlebar using the COMBO LOCK handle, which locks the front and rear suspensions simultaneously.


Stay focused on your effort with this single chainwheel. SRAM NX drive train, 1x11 single chainwheel, for lighter weight, more precision, faster gear changing, and greater durability. Rack: 30 teeth, easily replaceable (smallest chainwheel has 28 teeth, largest has 34 teeth) without changing the chain. Cassette: SRAM PG1130, 11/42 (11-13-15-17-19-22-25-28-32-36-42). The 42-tooth sprocket guarantees good gear reduction to help you climb the steepest slopes.

Handlebar / stem / steering / grips

Control your steering and stay precise. Rockrider Comp Flat handlebar is 720 mm wide for more stability. The B'TWIN COMP stem is adapted to the 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 screw onto the handlebars.


The choice of brakes is both powerful and progressive. Exclusive Rockrider by Tektro brakes with double pistons. 180 mm front disc, 160 mm rear disc.

Saddle / dropper seat post

The ROCKRIDER XC/AM has an ERGOFIT system for greater comfort while pedaling. The telescoping, hydraulic seat post is height-adjustable, with 120 mm of travel, and can be controlled directly from the mountain bike handlebars. The ability to lower the saddle in a split second with just a flick of the thumb is a true advantage of the All Mountain mountain bike. Feel free (and relaxed!) in your position on the bike during a technical descent.


27.5" SWITCH and RIDE wheels: choose maneuverability and propulsion! SUN RINGLE Duroc 30 wheels, with BOOST axles, in 15 mm at the front and 12 mm at the back. Outer rim width: 30 mm. Sealed bearings. Equipped with a watertight rim strip, Tubeless Ready compatible. To switch to Tubeless Ready: add a Tubeless valve and tire sealant, and replace the original tire with the Tubeless Ready version of the same model (available in DECATHLON stores).


Grip and move over all types of terrain. HUTCHINSON TORO 2 27.5 x 2.25 tires. Versatile tire designed for rides on all types of terrain: smooth, rocky, dry, muddy... Special studs to optimize steering, and sufficiently well spaced out so that they don't get clogged with mud when riding on muddy ground. High side knobs for good grip in the turns.


30.2 lbs in size S, without pedals. 30.4 lbs in size M, without pedals. 31 lbs in size L, without pedals. 31.6 lbs in size XL, without pedals. The weight can vary based on the tolerance of the components. The complete bike (MTB + fully equipped rider) should not exceed 265 lbs.

User guide & bike assembly

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Warning - california prop 65

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Product testing

Ask your local Decathlon store about testing before purchase.

Storage instructions

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


Lifetime (frame, stem, handlebars). Details on our website.

Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.