27.5+ Electric Mountain Bike E-ST 900 - Orange

A word from the team

We created this E-ST 900 mountain bike at our B'TWIN VILLAGE (Lille, France) especially for mountain biking enthusiasts. We have designed and tested the bike E-ST 900, involving riders at every stage of the project. We want you to have nothing but fun when you go mountain biking.

Is electric mountain biking a sport?

You have to pedal to go forward!

Electric assistance gives you up to 320% more pedaling power to get through obstacles, enjoy your mountain bike rides for longer, and help slower riders keep up in a group.

The motor stops when you stop pedaling.

The pedestrian mode offsets the mountain bike's weight when you need to stop.

How do you choose the right E-ST900 mountain bike size?

Several sizes available:

S: between 4'11" and 5'5"

M: between 5'5" and 5'9"

L: between 5'9" and 6'

XL: between 6'1" and 6'7"



If you are at the limit between 2 sizes:

Choose the smaller size for easier steering (easier to handle).

Choose the larger size for easier pedaling and comfort (straighter back).

A FRAME FOR STURDINESS AND FUN

The frame of the Rockrider E-ST900 electric mountain bike has been designed using 6061 aluminum with hydroformed tubes. Why? The battery and motor sit snugly on the frame to improve the robustness of this electric mountain bike.

The forged aluminum parts make it both compatible with the new 27.5"+ tire format (wider than the 27.5") and easy to maneuver.

A MOTOR WITH 90 NM TORQUE TO CLIMB ANY SLOPE

The BROSE central motor is specially designed for high mountain biking:

- 90 Nm torque to handle any slope

- metal housing for maximum durability

- belt for an ultra-quiet motor

- and watertight bearings to withstand environmental conditions, which can be tough when mountain biking.

A BATTERY WITH SAMSUNG CELLS

Our battery is equipped with SAMSUNG SDI cells, renowned for their high level of reliability and safety.

SAMSUNG guarantees responsible and sustainable mining as part of the "responsible minerals initiative" specially for cobalt extraction.

A battery that's easy to lock

Our Rockrider mountain bike team has designed a battery that locks in place with a simple lever. Child's play!

This locking system prevents any vibrations to the battery when you go riding on rough terrain.

A key lock is also installed if you want to protect your battery from theft. For example, if you park your bike in the street.

A simple, ergonomic control screen

A discreet LCD control screen. Located just to the side of your left grip, choose between the 4 assistance modes without letting go of the handlebars: Deactivated, Economy, Standard, and Boost.

You'll also find a host of useful information:



Assistance level

Battery level

Speed (instant, average, maximum)

Power supplied by the user

Remaining battery life

Distance covered (total and trip)

Micro USB plug for charging your smartphone/GPS/camera...

4 assistance modes for any situation

Mode 0 - Deactivated

The battery is not used.



Mode 1 - Economy +40%:

Extend your rides while conserving battery life. A perfect helping hand for small gradients.



Mode 2 - Economy +80%:

Gain power. A perfect helping hand for following other mountain bikers.



Mode 3 - Standard +160%:

This is the most versatile mode. Climb any slope without getting too tired and without using too much power.



Mode 4 - Boost +320%

ROCKSHOX FRONT HYDRAULIC AND PNEUMATIC SUSPENSION TO MAINTAIN CONTROL AND ABSORB BUMPS FROM ROUGH TERRAIN

Calmly face new obstacles (roots, pebbles, stones, etc.) with the Rockshox JUDY fork with 120 mm of travel.

This fork has:

- a thru axle and conical pivot for more durability.

- a pneumatic spring for optimal adjustment based on your weight

- a rebound adjustment and lockout for better control depending on your terrain.

SINGLE CHAINRING DRIVETRAIN, SIMPLE TO USE AND DESIGNED TO MEET THE DEMANDS OF ELECTRIC MOUNTAIN BIKING

To prevent the chain slipping, the E-ST900 electric bike is equipped with ChainFlow 3D anti-slip technology.

An end to confusion: simply change between the 10 speeds using the single shifter on the right handlebar.



In detail:

- ChainFlow and anti-slip 34-tooth chainring

- Shimano Deore M6000 Shadow+ rear derailleur

- Shimano Deore M6000 shifter

- KMC e10 Turbo electric specific chain

- 11 - 40 Shimano Deore 10 speed cassette

Wheels 27.5+ SunRingle Duroc 40

These wheels were specially designed for this mountain bike:

- 36 mm rims for improved durability and good grip on 2.8" wide tires.

- BOOST format thru axles (12x148 rear, 15x110 front) for greater durability

- Aluminum hubs with sealed bearings.

- Tubeless ready compatible

HUTCHINSON TAIPAN KOLOSS 2.8" TIRES FOR BETTER GRIP and GREATER COMFORT

So you feel safe on any terrain and for traction adapted to your motor, the E-ST900 mountain bike is equipped with Hutchinson Taipan Koloss 27.5+ tires, 2.8" across. Our test riders particularly liked these tires for their grip on the ground. Mounted on wide rims, these tires ensure grip, traction, and comfort. On any terrain.

180 MM DOUBLE HYDRAULIC DISC BRAKES: GET A GRIP ON YOUR BRAKING

No matter the conditions you ride in (dry, muddy, wet), the Tektro TKD32 hydraulic disc brakes on the front and rear provide powerful, progressive braking. Oversized 180 mm diameter discs provide even more power.

HANDLEBAR, STEM, GRIPS: TAKE CONTROL OF THE HANDLEBARS

With its adjustable stem, the E-ST900 controls are close to hand. The all-aluminum B'Twin stem is 70 mm (size S), 80 mm (size M/L), or 90 mm (size XL) and can be raised using 5 adjustment intervals: + 0 mm, + 7.5 mm, + 15 mm, + 22.5 mm, + 30 mm.



In detail:

- oversize 720 mm-wide aluminum frame for more control

- Ergonomic, lock-on B'Twin Sport Comfort grips for good grip and a comfortable feel.

Saddle: Comfortable and sporty seat

Since your mountain bike rides will get longer and longer, it is important to have a suitable seat. So our teams have designed the exclusive B'Twin Ergofit Evo saddle. Suitable for all hip sizes, its "hammock" shape is particularly good for sport touring.



The 31.6 mm aluminum seat post ensures compatibility with most adjustable and suspended saddles on the market.

PLATFORM PEDALS

The E-ST900 electric bike is supplied with B'Twin Flat platform pedals. The pedal surface is wider and the dots more pronounced to better keep the foot on the pedal.

Accessories

Your E-ST900 mountain bike is supplied with a bell, lights, wheel reflectors and pedals.



The frame is compatible with:

- front and rear mudguards

- stand

- bottle cage (on the horizontal tube)

- saddle pouch

- rear pannier rack (fixed onto the seat stays or special mounts for wide bikes, 148 mm gap for the rear wheel and 2.8" fat tire)

- child seat

...

OUR ADVICE FOR YOUR FIRST RIDE

Tip No.1

When mountain biking, there is always the risk of a fall: don't forget to wear a helmet.



Tip no. 2

A puncture could happen at any time, so always remember to take a repair kit and a 6 mm Allen key for removing your wheels.



Tip No.3

If you don't want to stop to drink, bring water in a bottle or water bladder to access it while riding.