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Mountain Bike 9-Speed 27.5 in, ST 120 Black

Name: Mountain Bike 9-Speed 27.5 in, ST 120 Black
Price: 577.5 CAD
Availability: OnlineOnly

4.8

Change speeds easily on this efficient and easy-to-handle ST 120 mountain bike. You will feel the precision and light weight provided by the single chainring (1 x 9 speeds) and mechanical disc brakes.

ID 8550574

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QUEBEC CONSUMERS ONLY: Decathlon Canada Inc. offers a wide selection of repair services, spare parts (in-store and online), and support information, but we do not guarantee their availability under the Consumer Protection Act. The only exceptions are the specific repair services listed below for purchases made on or after October 5, 2025
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Mountain Bike 9-Speed 27.5 in, ST 120 Black 1/12

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Ease of use
Change speeds easily: 9-speed single-chainring drivetrain.
Braking power
Thanks to its mechanical disc brakes
Cycling comfort
Enjoy: raised position, 80 mm (3") suspension, and hammock saddle
Directional control
Control your trajectory: cable disc brakes, tires with side knobs.
Robustness
An ultra-strong MTB: welded saddle, double-wall rims.
Lifetime warranty
Rockrider offers a lifetime warranty on the frame, handlebars, and stem

Description

Design details

Weight
S: 15.1 kg (33 1/4 lbs) M: 15.2 kg (33 1/2 lbs) L: 15.3 kg (33 3/4 lbs) XL: 15.5 kg (34 1/5 lbs) Net weight without pedals
A lightweight, comfortable, fun frame
Our designers created a frame that’s easy to get onto. The 100% aluminum CGF frame (Comfort Geometry Frame) is both comfortable and easy to handle. The slope angle keeps your back straight while the lower rear bases ensure the bike is agile through turns.
Front suspension
The 80 mm (3") front suspension helps you overcome your first obstacles on slightly uneven trails with no worries. Easily adjust the hardness using U-Fit technology (weight adjuster). Simply set the number to your weight (55 kg to 105 kg [120 to 230 lbs]) using the dial on the fork.
27.5" wheels and tires for dry terrain
Because your first tours will be on dry ground, the Dry 27.5 x 2.0 tires are most suitable. Their performance is optimized with a rounded central section and side lugs that provide good grip on turns.
Derailleur & drive train: A single chainring like the pros!
The single chainring is easy and efficient to use: 1 chainring and 9 speeds. accelerate on the flat and take on climbs with no compromise. With a single lever on the handlebar, there's no need to even think! - Rockrider 100 FC ATB 32-tooth single chainring equipped with 2 chain guides (anti-derailment) - Microshift RD-M46-L rear derailleur - Microshift SL-759 right shifter - Microshift H092 9-cog cassette (11-36 teeth) - Wide, sturdy KMC Z9 chain
Mechanical disc brakes
The Tektro 160 mm (6") double disc brakes provide powerful, progressive braking at the front and rear. The aluminum Tektro brake levers are precise and easy to grip. It takes only two fingers to brake. Three or four series of 10 dry, intermittent stops are enough to break in your pads. Try to get your brakes adjusted at least once a year.
Handlebars, stem, grips
With a stem that tilts 10° upwards, the riding position of the ST 120 is raised, accessible, and comfortable. In detail: 90 mm (3 1/2") aluminum stem with an angle of 10° for maximum comfort - 640 mm (25") wide steel handlebar, for stability and control -"Soft touch" lamellar grips for a firm yet soft and pleasant grasp.
What size mountain bike should I choose?
Several sizes available: S: between 1.50 m and 1.64 m (4'11" and 5'4") M: between 1.65 m and 1.74 m (5'5" and 5'8") L: between 1.75 m and 1.84 m (5'9" and 6') XL: between 1.85 m and 2.00 m (6'1" and 6'6") To adapt the bike to your height and size, try these tips: 1. You should be able to touch the ground with the tips of your toes when sitting on the saddle. 2. When your foot is on the pedal in the lowest position, your knee should be slightly flexed. 3. If you’re between two sizes, choose the larger size.

Mountain Bike 9-Speed 27.5 in, ST 120 Black

How to get it

Features

Description

Design details

Specifications

Details

Composition

Legal notice

EU product safety contact

Usage & care

Description

Design details

Specifications

Details

Composition

Legal notice

EU product safety contact

Specifications

Details

Composition

Legal notice

EU product safety contact

Usage & care

How to use

How to repair or replace

Lifetime (frame, stem, and handlebars). Availability of spare parts: Two years.

Care instructions

Usage precautions

Storage

Specifications

Details

Composition

Legal notice

EU product safety contact

How to use

How to repair or replace

Lifetime (frame, stem, and handlebars). Availability of spare parts: Two years.

Care instructions

Usage precautions

Storage