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W ST MTB E BIKE

ROCKRIDER E-ST 900 Women's Electric Mountain Bike - 27.5+

ROCKRIDER
5/5
User rating
Decathlon
was £1,699.99 -%

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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.
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

IS ELECTRIC MTB 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.

Which is the right size?

Several sizes available:
S: between 1.50m and 1.64m / 21.9kg
M: between 1.65m and 1.74m / 22.1kg
L: between 1.75 m and 1.84m / 22.2kg
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 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.

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 70NM TORQUE TO CLIMB ANY SLOPE

The BROSE T Aluminium central motor is specially designed for high altitude mountain biking:
- 70 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 has designed a battery that locks in place with a simple lever. Child's play!
This locking system prevents the battery vibrating 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. 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: 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 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 HYDRAULIC AND PNEUMATIC SUSPENSION TO MAINTAIN CONTROL AND ABSORB BUMPS FROM ROUGH TERRAIN

The E-ST900 electric bike is equipped with a single chainring and ChainFlow 3D anti-drop technology to prevent chain drops.
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 - 40 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 60 mm (size S/M/L) and can be raised using 5 adjustment intervals: + 0mm, + 7.5mm, + 15mm, + 22.5mm, + 30mm.
In detail:
- Narrow 680 mm-wide aluminium handlebars for women
- Ergonomic, lock-on B'Twin Sport Comfort grips for good grip and a comfortable feel.

ERGONOMIC WOMEN'S SADDLE: COMFORTABLE AND SPORTY SEAT

Since your mountain bike rides will get longer and longer, it is important to have a suitable seat designed for women's hips. Our teams have designed an ergonomic saddle which is hollow in the centre to prevent chafing and enhance comfort.
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 fitted 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 RIDES

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.

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Composition / advice

Composition
Frame
100.00% Aluminium 6061
Stock advice Store it in a warm, 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 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).

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, handlebar). Availability of spare parts: 2 years.Guaranteed for 500 charges.

Product benefits

Anatomic design Comfort for women: saddle, adjustable fork, raised position, closer brakes
Power Overcome any slope with its motor with 70 Nm torque.
Autonomy Average ride: 4 hours, or 58km, of sports MTB use - 504Wh 36V 14Ah.
Smooth pedalling Pedal naturally with its built-in central motor. An essential for MTB.

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

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Your reviews

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

Women's MTB E-ST900 27.5
Maintenance and repair
Maintenance and repair
Women's MTB E-ST900 27.5"
Because you look after your own health, we look after that of your products: tips for initial settings, maintenance and repair advice, video tutorials, FAQs, instructions...
See our tips Spare parts