Free Delivery over £30* | Free Click & Collect at Decathlon Stores | 365 Days to Return

An electric MTB with a very powerful central motor

  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
  • 15 - Cycling Cycling - E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+ ROCKRIDER - Bikes
Reference : 8487240
Add to my wish list
Product already added
15 - Cycling

ROCKRIDER E-ST 900 ELECTRIC MOUNTAIN BIKE, GREY - 27.5+

ROCKRIDER
4.4/5

Colour : DARK GREY / LIGHT GREY

User rating
Decathlon
until £1,599.99 -%

From

£1,599.99**
This price includes a recycling fee for electrical equipment and batteries DecathlonDeeeTaxMentionAfterPrice / Since

From To

* Sales from to Until end of stock
* From and limited stock
£1,599.99 %
Before£0.00NoW£1,599.99**
This price includes a recycling fee for electrical equipment and batteries DecathlonDeeeTaxMentionAfterPrice / Since

* From To

* Sales from to Until end of stock
* From and limited stock
Check availability in store
Our most powerful Electric Mountain Bike to date. This Rockrider pedelec hardtail MTB will allow you to climb faster and rider further than before. A true off road e-bike built for comfort and control thanks to the relaxed geometry, wider bars, 120mm travel Rockshox Judy forks, Shimano Deore M6000 groupset, 40mm rims, front & rear thru axles and wide 27.5x2.8 tyres.

Powered by the reliable BROSE T 90 Nm central motor with a Samsung SDI cell battery (504Wh 36V 14Ah) and built around the Lifetime warranty hydroformed alloy Rockrider frame, this e-MTB really is built to last.
.
 

PRODUCT BENEFITS

Power Overcome any slope with the motor's torque of 90Nm at 250 W.
Autonomy Average ride: 3 hours of sports mountain biking use with its 504Wh 36V 14Ah.
Smooth pedalling Pedal naturally with its built-in central motor. An essential for MTB.
Cycling comfort You'll love its comfort: raised position, wide tyres, ergonomic saddle...
Directional control Good control with the 2.8" tyres, wide handlebars and Rockshox Judy fork.

TECHNICAL INFORMATION

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 pedalling 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 pedalling.
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 1.50m and 1.64m
M: between 1.65m and 1.74m
L: between 1.75m and 1.84m
XL: between 1.85 m and 2.00 m
If you are on the limit between 2 sizes:
Choose the smaller size for easier steering (easier to handle).
Choose the larger size for easier pedalling 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 aluminium with hydroformed tubes. Why?
The battery and motor sit snugly on the frame to improve the robustness of this electric mountain bike.
The forged aluminium parts make it both compatible with the new 27.5"+ tyre format (wider than the 27.5") and easy to manoeuvre.

A MOTOR WITH 90NM TORQUE TO CLIMB ANY SLOPE

The BROSE T Aluminium 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.
Our battery supplier sources its minerals responsibly and sustainably, and is part of the "Responsible Minerals Initiative".

A battery that's easy to lock

Our Rockrider mountain bike team designed a battery that locks in place with a simple lever. Child's play!
This locking system prevents any vibrations to the battery when 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 four 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 & anti-slip 34-tooth chainring
- Shimano Deore M6000 Shadow+ rear derailleur
- Shimano Deore M6000 shifter
- KMC e10 Turbo electric specific chain
- 11 - 42 Shimano Deore 10 speed cassette

27.5+ Sunringle Duroc 40 WHEELS

These wheels were specially designed for this mountain bike:
- 36mm rims for improved durability and good grip on 2.8" wide tyres.
- BOOST format thru axles (12x148 rear, 15x110 front) for greater durability
- Aluminium hubs with sealed bearings.
- Tubeless ready compatible

HUTCHINSON TAIPAN KOLOSS 2.8" TYRES FOR BETTER GRIP & 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+ tyres, 2.8" across. Our test riders particularly liked these tyres for their grip on the ground. Mounted on wide rims, these tyres ensure grip, traction, and comfort. On any terrain.

180MM 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 180mm 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-aluminium 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: + 0mm, + 7.5mm, + 15mm, + 22.5mm, + 30mm.
In detail:
- oversize 720mm-wide aluminium 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, the "hammock" shape is particularly good for sporty rides.
The 31.6 mm aluminium 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 & 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.

Weight

S : 1M50-1M65: 21.9 kg
M : 1M65-1M75: 22.1 kg
L : 1M75-1M80: 22.2 kg
XL : 1M80-1M95: 22.3 kg
Net weight without pedals

See more See less

COMPOSITION / ADVICE

Composition
Frame (for bike)
100.00% Aluminium 6061
Stock advice Store it in a warm, dry place away from corrosive products and salty air. Never store with a dead battery and remember to recharge it at least once every six months.
Restricted use : Don't forget to remove the battery to handle the chain.
instructions To get more information about this product, please read instructions
Legal notice Your bike's weight may vary due to tolerances in the components. To make your wheels last longer, we recommend not exceeding the maximum weight of 120kg (rider with mountain bike).
How to choose your product

OUR COMMITMENTS

Test Product Our engineers always have real riders test all our products in real conditions. These tests round out our lab tests and let us validate all our products before they hit store shelves.
Guarantee : Lifetime (frame, stem, handlebars). Availability of spare parts: 2 years.Guaranteed for 500 charges.
 

FREQUENTLY BOUGHT TOGETHER

Don't forget!

CUSTOMERS HAVE ALSO VIEWED

YOUR REVIEWS

REVIEWS BY OUR TEAM MEMBERS

OUR CUSTOMERS PICTURES

OUR SERVICES

E-ST900 Mountain Bike - Grey
Maintenance and repair
Maintenance and repair
Spare parts