WHAT SIZE MOUNTAIN BIKE TO CHOOSE?
ATTENTION, for the size S, the minimum size is 1m60 and not 1m50 as indicated in the grid of the drop-down menu.
If you are at the border between 2 sizes:
Take the lower size to privilege the phases of piloting (bike easier to handle) and comfort (more straightened back).
Take the higher size to privilege the phases of pedaling with a more lengthened position (position more adequate to the output).
IS ELECTRIC MOUNTAIN BIKING A SPORT?
To move forward, you have to pedal!
Electric assistance complements your pedaling by +320% to help you overcome obstacles.
So you can enjoy your mountain bike rides for longer.
The motor stops assisting as soon as you stop pedaling.
Pedestrian mode compensates for the weight of the mountain bike when you need to get off the ground.
A WORD FROM THE TEAM
Passionate about mountain biking, we designed and developed the E-ST 900 electric mountain bike entirely in France at BTWIN VILLAGE (Lille).
We designed, engineered and tested the E-ST 900 mountain bike, involving mountain bikers in every stage of the project.
STURDY, PLAYFUL FRAME
The frame of the ROCKRIDER E-ST900 VTTAE has been designed in 6061 aluminum with hydroformed tubes. Why is this? So that this electric mountain bike is more robust and the battery integrates well with the frame.
Its forged aluminum parts make it both compatible with the new format 27.5"+ tire (wider than the 27.5") at the rear, while keeping the bike easy to handle. We've kept the frame geometry with short chainstays to enhance ride quality.
70NM TORQUE MOTOR
The BROSE T Aluminum central motor is specially designed for mountain biking:
- 70 Nm of torque for big obstacles and long gradients
- metal casing for maximum robustness
- belt drive for ultra-quiet operation
- sealed bearings to withstand the vagaries of the mountain-biking climate.
SAMSUNG BATTERY CELLS
Our battery is equipped with SAMSUNG SDI cells, renowned for their high level of reliability and safety.
BATTERY LOCK
Our MTB team ROCKRIDER has designed a battery that locks with a simple lever. Child's play!
This clamping system prevents the battery from vibrating when venturing out on rough terrain.
There's also a key lock if you want to protect your battery from theft. For example, if you park your electric ATV in the street.
CONTROL SCREEN
A discreet LCD control screen. Placed right next to your left handlebar, don't let go of your handlebar and choose between the 4 assistance modes available: Economy+, Economy, Standard and Boost.
You'll also find all the information you need:
-Assistance level
-Battery level
-Speed (instant, average, maximum)
-Remaining range
-Distance covered (total and trip)
4 ASSISTANCE MODES
Mode 0 - Off
Battery not in use.
Mode 1 - Economy +40% :
Extend your outings while conserving battery power. Ideal for tackling short gradients.
Mode 2 - Economical +80% :
Gain power. Ideal for keeping up with other mountain bikers.
Mode 3 - Standard +160%:
This is the most versatile mode. Climb any gradient, without getting too tired & while maintaining reasonable fuel consumption.
Mode 4 - Boost +320%
ROCKSHOX FRONT SUSPENSION
The ROCKSHOX JUDY hydraulic fork has 120 mm of travel, so you can tackle obstacles like roots, rocks and stones with complete peace of mind.
This fork features:
- a tapered steerer tube and through-axle for greater strength.
- an air spring for optimum adjustment to your weight
- locking and rebound adjustment for better control, depending on your riding terrain.
SINGLE-PLATE TRANSMISSION
To avoid derailment, the E-ST900 electric bike has a single chainring with ChainFlow 3D anti-derailment technology.
The 10 gears are very easy to manage, with a single lever on the right of your handlebars.
In detail:
- 34-tooth ChainFlow & Antideraillement chainring
- Rear derailleur SHIMANO DEORE M6000 Shadow+ 10-speed, braked clevis
- Right-hand shifter SHIMANO DEORE M6000
- Cassette SHIMANO DEORE 10 sprockets 11 to 42 teeth
- Chain KMC E10 Turbo special electric
27.5+ WHEELS SUNRINGLE DUROC 40
These wheels have been specially designed for this mountain bike:
- 36mm rims (width between hooks), 32 spokes front and rear, for greater strength and a good grip on the wide 2.8" tires.
- format BOOST 12x148 axles in the back and 15x110 in the front, for greater strength
- Aluminum hubs with sealed bearings.
- TUBELESS READY rims: you'll need TUBELESS tires, special PRESTA valves and puncture-proof fluid.
TIRES HUTCHINSON
The E-ST900 mountain bike is equipped with HUTCHINSON TAIPAN KOLOSS 27.5"+ tires in a wide 2.8-inch section, so you can feel safe on any terrain and get the right traction for your engine. Our test riders particularly appreciated these tires, which grip the terrain well. Mounted on wide rims, these tires provide grip, traction and comfort. And that on any terrain.
HYDRAULIC DISC BRAKES
No matter what conditions you're riding in (dry/wet/muddy), Tektro TKD32 front and rear hydraulic disc brakes deliver powerful, progressive braking. 180mm oversize discs give you even more power.
HANDLEBARS, STEM, HANDLES
With its adjustable stem, the E-ST 900's controls are at your fingertips. The all-aluminum ROCKRIDER stem, measuring 70 mm (size S), 80 mm (size M / L) and 90 mm (size XL), can be adjusted upwards in 5 stages: + 0 mm, + 7.5 mm, + 15 mm, + 22.5 mm, + 30 mm.
Details:
-Aluminium hanger ROCKRIDER SPORT "oversize" 720 mm width
-Ergonomic "soft touch" ROCKRIDER handles, for good grip and pleasant contact
SADDLE
Because your mountain bike rides are going to be longer and longer, it's important to be well "seated". That's why our teams have come up with the exclusive ROCKRIDER ERGOFIT PRO saddle. Adapted to all pelvis widths, its "hammock" profile is appreciated during sporty rides.
The 31.6 mm diameter aluminum seatpost guarantees compatibility with most adjustable and suspended seatposts on the market.
FLAT PEDALS
The bike is supplied with flat MTB 520 GRIP pedals (cod.8487130), which have a wider support surface and more studs for better support of the foot on the pedal.
Nevertheless, if you want better pedaling performance and better control of the MTB when riding, we recommend replacing them with the automatic pedals with platform or with wide flat aluminum pedals.
ACCESSORIES
Your E-ST900 mountain bike comes complete with bell, lights, wheel reflectors and pedals.
The frame is compatible with:
- front and rear mudguards
- kickstand on base
- water bottle holder (on horizontal tube)
- saddlebag
- rear luggage rack (chainstay-mounted or special for wide bikes, 148mm center distance at rear wheel & large 2.8" tire)
- child seat
...
OUR TIPS FOR YOUR FIRST OUTING
Tip 1
On a mountain bike, you're never safe from a fall: don't forget to wear a helmet.
Tip 2
A puncture can always happen, so remember to take along a repair kit and a 6mm Allen wrench to dismantle your wheels.
Tip 3
If you don't feel like stopping for a drink, remember to take along water in a jug or water bag so you can access it while riding.
CARE INSTRUCTIONS
Leave your battery on the bike when you wash it with a hose. It will protect the connectors from oxidation.
Warranty
Lifetime (frame, stem, handlebars). Spare parts availability: 2 years. Battery guaranteed for 500 cycles.
