WHAT SIZE MOUNTAIN BIKE TO CHOOSE?
Several sizes are available:
M: between 1.65 m and 1.74 m
L: between 1.75 m and 1.84 m
XL: between 1.85 m and 2.00 m
If you're on the borderline between 2 sizes:
Choose the smaller size for better handling (easier to handle) and comfort (straighter back).
Choose the larger size for better pedaling and a more extended position (better performance).
MIXED FRAME
The ST 900 S MTB frame is MIXED.
Studied down to the smallest detail, with a very pronounced sloping top tube, over a fairly wide size range (from M:1m65 to XL:2m00), the ST 900 S MTB frame is not only light and comfortable, it's also MIXED.
For even greater comfort, the women on the ROCKRIDER team recommend the SPORT FEMME 500 saddle, adapted to women's morphology.
A WORD FROM THE TEAM
Passionate about mountain biking, we designed and developed the ST 900 S mountain bike entirely in France at BTWIN VILLAGE (Lille).
A comfortable, efficient mountain bike: ROCKSHOX 120 fork mm and AIR shock absorber for easy overcoming of obstacles, single chainring and 27.5" double-walled wheels lightened for efficiency...
Mountain bikers were involved in every stage of the project to validate this bike.
LIGHTWEIGHT, COMFORTABLE AND PLAYFUL
For greater lightness and efficient pedaling, the frame of the ROCKRIDER ST 900 S 27.5" mountain bike has been designed in 6061 aluminum (only 2.5 KG in size M, without shock absorber), with a "double butted" front triangle 200 grs lighter than that of the ST 540 S 27.5",
. Its rear shock absorber of 120 mm is based on a mono-pivot system (more sensitive to small terrain shocks, while remaining firm against large impacts) and on sealed bearings, for good longevity.
ROCKSHOX FRONT SUSPENSION
The ROCKSHOX 30 SILVER 120 fork mm with AIR is 400 grams lighter than that of the ST 540 S mountain bike. Its tapered steerer tube provides even greater rigidity and precise trajectory control.
Adjust the fork's hardness and rebound with ease.
The COMBO LOCK quick release system, with direct access to the handlebars, prevents pumping and loss of speed on rolling sections.
REAR AIR SUSPENSION
This mountain bike is equipped with a lightweight air shock X-FUSION O2 PRO L 120 mm, specifically tuned for the frame. Its Schrader valve makes it easy to adjust according to your weight.
A specific "high-pressure" pump is required to adjust this shock absorber (Suspension pump ROCKRIDER - ref: 3310286).
Finally, the COMBO LOCK system, with direct access to the handlebars, prevents pumping and loss of speed on rolling sections.
DERAILLEUR & TRANSMISSION: A SINGLE CHAINRING LIKE THE PROS!
Discover the ease and efficiency of the single chainring.
1 chainring and 11 gears: accelerate on the flat and tackle climbs easily without compromise.
1 single shifter on the handlebars: you can adapt your speed instantly, like the pros, to the hazards of the terrain!
In detail:
-Single chainring SRAM X1000 32 teeth
-Rear derailleur MICROSHIFT M665 11 speeds
-Right shifter MICROSHIFT M8515
-Cassette MICROSHIFT H113 11 sprockets 11 to 46 teeth
-Chain KMC X11
HANDLEBARS, STEM, HANDLES
With its adjustable stem, the ST 900 S's controls are a breeze to use. Made entirely of aluminum, the ROCKRIDER stem measures 70 mm (size S), 80 mm (size M / L) and 90 mm (size XL) and can be adjusted upwards in 5 stages: + 0 mm, + 7.5 mm, + 15 mm, + 22.5 mm, + 30 mm.
In detail:
ROCKRIDER SPORT "oversize" 720 mm
-ERGONOMIC ROCKRIDER handlebars, for good grip and pleasant contact
SADDLE
Our teams have imagined and designed an exclusive ROCKRIDER ERGOFIT Pro saddle. Suitable for all pelvic widths, its "hammock" profile is ideal for sporty rides. With a diameter of 31.6 mm and a length of 400 mm , the ROCKRIDER SPORT aluminum seatpost combines lightness with a wide range of adjustments.
Adjust the height of your saddle quickly and without tools, thanks to the easy-to-use adjustment lever on the saddle clamp.
HYDRAULIC DISC BRAKES
No matter what conditions you're riding in (wet or dry), the dual hydraulic disc brakes ROCKRIDER by TEKTRO of 180 mm for the front and 160 mm for the rear, are there for you, even in the mud.
Hydraulic braking gives you more power and progressiveness, and much less muscular effort to apply to the levers.
The aluminum brake levers are easy to grip and precise.
27.5" LIGHTENED WHEELS, LIGHT AND WIDE TIRES
Lightened wheels: the double-walled, sleeved rims, combined with the lightened tires, are 230g lighter than on the ST 540 S.
With 28 spokes, they're just as stiff and resistant.
The ROCKRIDER ALL CONDITIONS LIGHT (60 TPI) 27.5" tires have lateral studs for all-terrain use. A 2.2 width means more comfort and grip on technical sections.
23 mm TUBELESS READY rims: SCHRADER valves, TUBELESS rim tape, TUBELESS tires, and puncture-proof fluid to add.
FLAT PEDALS
The ST 900 S comes with flat ROCKRIDER FLAT mountain bike pedals, with a wider support surface and more studs for better foot support on the pedal.
TRANSPORT & STORE YOUR MOUNTAIN BIKE EASILY
We've added a quick-release system for easy front and rear wheel removal and mounting.
Our tip: a bike rack is a simple way to transport your mountain bike without dirtying your car.
ACCESSORIES
Your ST 900 S mountain bike comes complete with bell, lights, stem-mounted speedo & GPS, wheel reflectors (reflectors) and pedals.
The frame is compatible with:
-Side-opening water bottle holder (ref. 8548543)
-Mountain bike mudguard kit (ref. 8385291)
-Saddle bags 100 (ref. 8347394) and 500 (ref. 8354448)
COMFORT & SAFETY
Your bike's equipment (chain, derailleur, brakes, etc.) will adjust.
Warranty
Lifetime (frame, stem, handlebars). Spare parts availability: 2 years.
Weight
M - 165-174cm : 13.95 kg
L - 175-184cm : 14 kg
XL - 185-200cm : 14.1 kg
