Free Delivery over £30* | Free Click & Collect at Decathlon Stores | 365 Days to Return
Reference : 8545546
Add to my wish list
Product already added
MEN SPORT TRAIL MTB ELECTRIC BIKE

ROCKRIDER E-ST900 Electric Mountain Bike, Grey/Orange - 27.5+

ROCKRIDER
4.5/5

Colour : DARK GREY / Fluo orange

User rating
Decathlon
until £1,699.99 -%

From

£1,699.99**
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
£1,699.99 -%
Before£0.00NoW£1,699.99**
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
This 27.5+ electric mountain bike (EAMTB) is designed for riding trails in the mountains. With the E-ST900 electric mountain bike (EAMTB), there are no more limits. Ride over any obstacle thanks to the motor's 70 Nm torque, and enjoy longer rides with the 500 Wh battery.
Not Available Now

We currently have limited capacity to build bikes in our warehouse. Due to this, we are limiting the number of bikes we sell per day and you might not be able to process your order at checkout. The count resets at 11pm every day so that would be the best time to try, although we do have a peak of attempts at this time so we can't guarantee a slot for everyone.

 

Technical Information

WHAT SIZE MOUNTAIN BIKE TO CHOOSE?

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) and comfort (straighter back).
Choose the larger size for easier pedalling with a more stretched-out position (position more suited to performance).

IS ELECTRIC MTB A SPORT?

You have to pedal to go forward!
The electric assistance boosts your pedalling by 320%, helping you ride over obstacles.
You'll get to enjoy longer MTB rides.
The motor stops providing electrical assistance when you stop pedalling.
The walking mode offsets the mountain bike's weight when you need to walk your bike.

A WORD FROM THE TEAM

Our team of mountain bike enthusiasts created this E-ST 900 electric mountain bike at our B'Twin Village in Lille, France.
We designed and tested the E-ST 900 MTB by involving MTB riders at every stage of the project.

STURDY, PLAYFUL FRAME

The frame of the Rockrider E-ST900 electric mountain bike has been designed using 6061 aluminium with hydroformed tubes. Why? The battery sits snugly on the frame to improve the robustness of this electric mountain bike.
The forged aluminium parts make it compatible with the new 27.5"+ tyre format (wider than the 27.5") in the rear, while remaining easy to manoeuvre. We've kept a frame geometry with short bases for easier steering.

MOTOR WITH 70NM TORQUE

The BROSE T Aluminium central motor is specially designed for high altitude mountain biking:
- 70 Nm torque to handle large obstacles and steep gradients
- metal housing for maximum durability
- belt for an ultra-quiet motor
- sealed bearings to hold up to tough environments while mountain biking

SAMSUNG BATTERY 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".

BATTERY LOCK

Our Rockrider mountain bike team has designed a battery that locks in place with a simple lever. Child's play!
This locking system stops the battery getting shaken when you go adventuring 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.

CONTROL SCREEN

A discreet LCD control screen. The screen is right next to your left grip so you don't have to let go of the handlebar to choose from the 4 assistance modes available: Eco+, Economy, Standard, Boost.
You'll also find a host of useful information:
Assistance level
Battery level
Speed (current, 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

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 keeping up with 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 SUSPENSION

Ride over obstacles (roots, pebbles, stones, etc.) easily thanks to the Rockshox JUDY fork with 120 mm of travel.
This fork has:
- a thru axle and tapered steerer tube for more durability.
- pneumatic spring for optimal adjustment based on your weight
- rebound adjustment and lockout for better control, depending on the terrain.

SINGLE CHAINRING DRIVETRAIN

The E-ST900 electric bike is equipped with a single chainring and ChainFlow 3D anti-drop technology to prevent chain drops.
A single shifter on the right handlebar makes it easy to shift between the 10 speeds.
In detail:
- ChainFlow anti-derailment 34-tooth chainring
- SHIMANO DEORE M6000 Shadow+ 10-speed rear derailleur with long cage
- SHIMANO DEORE M6000 right shifter
- SHIMANO DEORE 10-cog cassette (11-42 teeth)
- KMC E10 Turbo special e-bike chain

27.5+ Sunringle Duroc 40 Wheels

These wheels were specially designed for this mountain bike:
- 36 mm rims (width between brackets) and 32 spokes at the front and rear for greater durability and a good hold on wide (2.8") tyres.
- BOOST thru axles (12x148 rear, 15x110 front) for greater durability
- Aluminium hubs with sealed bearings
- TUBELESS READY rims: you will need tubeless tyres, Presta valves, and puncture sealant.

HUTCHINSON TYRES

So you feel safe on any terrain, and to provide traction suited to your motor, the E-ST900 mountain bike is equipped with Hutchinson Taipan Koloss 27.5+ tyres with a 2.8" cross-section. Our test riders particularly liked these tyres for their good grip. Mounted on wide rims, these tyres ensure grip, traction and comfort on any terrain.

HYDRAULIC DISC BRAKES

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.

HANDLEBARS, STEM, GRIPS

The adjustable stem brings the E-ST 900 controls to your hands. The all-aluminium ROCKRIDER stem is 70 mm (size S), 80 mm (size M/L), or 90 mm (size XL) and can be raised to 5 adjustment intervals: + 0mm, + 7.5mm, + 15mm, + 22.5mm, + 30mm.
In detail:
- 720mm oversize ROCKRIDER SPORT aluminium handlebar
- ROCKRIDER SPORT "soft touch" ergonomic grips for good grip and a comfortable feel

SADDLE

Since your mountain bike rides will get longer and longer, it is important to sit comfortably. So our teams designed the exclusive ROCKRIDER Ergofit Pro saddle. It fits all hip sizes and has a curved shape that is particularly good for sport trail rides.
The 31.6 mm aluminium seat tube ensures compatibility with most dropper and suspension seat posts on the market.

PLATFORM PEDALS

The E-ST900 electric bike comes with ROCKRIDER Flat MTB 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.

LEGAL DISCLAIMER

To ensure components last longer, we recommend a maximum load of 120 kg (rider and MTB included).

CARE TIPS

Leave your battery on the bike when washing using a hose. This will protect the connectors from rusting.

Weight

S - 150-164CM: 21.9 kg
M - 165-174CM: 22.1 kg
L - 175-184CM: 22.2 kg
XL - 185-200CM: 22.3 kg
Weight without pedals.

See more See less

Composition / advice

Composition
Frame (for bike)
100.00% Aluminium 6061
Stock advice Store it in a cool, dry place away from corrosive products and salty air. Never store with the battery flat, 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 To ensure components last longer, we recommend a maximum load of 120 kg (rider and MTB included).
How to use 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.
 

Product benefits

Power Head for the summits powered by a 250W motor with 70Nm torque
Autonomy Ride for around 3 hours with its 500Wh 36V 14Ah battery.
Smooth pedalling The built-in motor automatically assists you when needed. Perfect for MTBing.
Cycling comfort Enjoy: raised position, 120 mm suspension, very wide tyres, Ergofit saddle.
Directional control Control your trajectory: ROCKSHOX Judy fork, extra wide HUTCHINSON tyres

FAQ

Q : How to assemble your bike?
Everything you need to know about making sure your bike is comfortable, secure and ready to ride.
Q : How do you adjust your brakes?
Having properly functioning brakes is vital when out on the road. Check out how to get them working to your liking.
Q : How to replace a brake lever on a bike?
Having properly functioning brakes is vital when out on the road. Here’s a video to show you how to make sure your new brake level is working nicely.
Q : How to replace a disc brake?
Having issues with your disc brake? Then this video is for you.
Q : How to adjust your bike handlebar?
A suitable handlebar height is essential to your cycling safety and comfort. Find out how to adjust it to your liking with our video.
Q : Do you offer a Cycle To Work scheme?
Find out everything you need to know about way of getting to work that’s good you and the environment.Check Here

your reviews

Reviews by our Team Members

Our customers pictures

FAQ

Q : How to assemble your bike?
Everything you need to know about making sure your bike is comfortable, secure and ready to ride.
Q : How do you adjust your brakes?
Having properly functioning brakes is vital when out on the road. Check out how to get them working to your liking.
Q : How to replace a brake lever on a bike?
Having properly functioning brakes is vital when out on the road. Here’s a video to show you how to make sure your new brake level is working nicely.
Q : How to replace a disc brake?
Having issues with your disc brake? Then this video is for you.
Q : How to adjust your bike handlebar?
A suitable handlebar height is essential to your cycling safety and comfort. Find out how to adjust it to your liking with our video.
Q : Do you offer a Cycle To Work scheme?
Find out everything you need to know about way of getting to work that’s good you and the environment.Check Here

Our services

27.5+ MTB E-ST 900 - Orange
Maintenance and repair
Maintenance and repair
Spare parts