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Rockrider 27.5" Mountain Bike ST 900 S
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Travel
120 / 120mmFork / rear shock
Wheels
27.5″
Brakes
Hydraulic disc
Not published by the manufacturer
Sizes and geometry
Components
5 of 5 identified
Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.
The ROCKSHOX 30 SILVER 120 mm AIR shock is 400 g lighter than the one on the ST 540 S mountain bike. Its tapered steerer tube offers even more stiffness and precision when steering. Easily adjust the fork's bounce and stiffness. Its quick COMBO LOCK lockout system, which you can control from the handlebar, helps prevent bobbing and loss of speed on faster sections.
This bike has a lightweight 120 mm X-FUSION O2 air shock that has been specially adapted to fit this frame. You can easily adjust it, based on your weight, using its Schrader valve. A special "high pressure" pump is required to adjust this shock (Rockrider fork and shock pump - ref: 3310286).Its quick COMBO LOCK lockout system, which you can control from the handlebar, helps prevent bobbing and loss of speed on faster sections.
The single chainring is easy and efficient to use. 1 chainring and 11 speeds: Accelerate on the flats and easily tackle the climbs. 1 single shifter on the handlebar: adapt your speed instantly like the pros as the terrain changes! Details: -SRAM X1000 32-tooth single chainring-Microshift M665 11-speed rear derailleur-Microshift M8515 right shifter-Microshift H113 11-cog 11 to 46 teeth cassette -KMC X11 chain
No matter what conditions you ride in (dry/wet), the Rockrider by Tektro 180 mm (front) and 160 mm (back) double hydraulic disc brakes will come through for you, even in the mud. Hydraulic brakes deliver more powerful and progressive braking and require less effort applied to the brake levers. The aluminium brake levers are easy to grip and precise.
Our teams designed and created an exclusive Rockrider Ergofit Pro saddle. Designed for all hip widths, its hammock shape is very comfortable for long, athletic rides. The aluminium Rockrider Sport seat post is lightweight and has a wide adjustment range, with a 31.6 mm diameter and 400 mm in length. Quick and easy tool-free adjustment of your saddle height using the adjustment lever on the seat post clamp.
Specifications
Frame and fork
Intended fit
Unisex
Suspension
Suspension configuration
Full suspension
Front travel
120 mm
Rear travel
120 mm
Drivetrain
Derived by Bikelake
Front chainrings
1
Smallest chainring
46
Largest chainring
46
Wheels and brakes
Wheel configuration
Same size
Brake type
Hydraulic disc
Fit and controls
Shifting
Mechanical
Additional specifications
Fork spring
Air
Wheel size
27.5″
Technical analysis
2 measures
How these figures sit among bicycles of the same class and model year. Context, not a ranking.
Front travel
How we calculated this
Observed range: 51 mm to 170 mm. Median: 130 mm.
120mm
This value is within the central range for this class.
120 mmTypical range150 mm
Cohort
Mountain / Trail
Model year: 2025
Sample
1,808 bicycles with this information
Coverage
97.5% of the class
Shifting
How we calculated this
This analysis describes frequency, not preference.
Mechanical
387 of 1,847 bicycles with this information use electronic shifting.
Electronic 20.9%Mechanical 79.0%
Cohort
Mountain / Trail
Model year: 2025
Sample
1,847 bicycles with this information
Coverage
99.6% of the class
Lineup changes
The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.
Differences across 2025 builds
Differences across 2025 builds
Specification
This bicycle
Rockrider 27.5" Mountain Bike ST 900 S