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E-ST500 Women's Electric Mountain Bike, Blue - 27.5"

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was £999.99 -%


This price includes a recycling fee for electrical equipment and batteries DecathlonDeeeTaxMentionAfterPrice / Since

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£999.99 -%
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
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Local trails will be even more fun with this electric mountain bike. Thanks to the electrical assistance delivering 42NM of torque coupled with the 420w/h battery, it'll make light work of hills, while the torque-controlled power ensures smooth and reliable pedaling. It's comfortable too: check out the raised position, wide tyres and ergonomic saddle. Add to that grippy 27.5x2.35 tyres and powerful mechanical disc brakes, and no doubt you're already sold.
  • Average assisted ride time: 2.5 hours
  • Smooth, natural pedalling thanks to torque-controlled power
  • Easy to control

Technical Information

The story of the Rockrider E-ST500 electric mountain bike

Entirely designed and developed in France at the B'Twin Village (Lille), this mountain bike is the fruit of the work of an expert team of passionate mountain bikers. Our Rockrider team has designed and tested this electric Rockrider E-ST500 with its test riders. All that's left to do is for us to wish you happy riding on this electric mountain bike.


Several sizes available:
S: between 1.50m and 1.64m
M: between 1.65m and 1.74m
L: between 1.75m and 1.84m
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).


The frame of the Rockrider E-ST 500 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 both compatible with the new 27.5"+ tyre format (wider than the 27.5") and easy to manoeuvre. We've kept the frame geometry low to make sure that the bike stays comfortable to ride.


The rear wheel motor is specially designed for mountain biking:
- a torque of 42Nm to overcome any slope
- a wheel axle of 150x12mm to stand up to rough terrain
- watertight bearings to withstand environmental conditions which can sometimes be tough.
What if you get a puncture? An 8mm Allen key is all you need to unscrew the wheel nuts. This tool is available in our 900 multi-purpose tool.


Our battery is equipped with LG, LGC-MG1 cells, renowned for their high level of reliability and safety.

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, such as when parking your bike on 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:
- Chronometer
- Speed
- Distance covered
- % battery level
- Remaining battery in km
- Active assistance mode
- Reset
And: the 0.5A USB port for charging your smartphone.

A torque sensor for natural pedalling, even on difficult terrain

Wondering how to conveniently control your speed, particularly on technically difficult terrain? Our Rockrider mountain bike team has included a torque sensor on the bottom bracket of the E-ST 500. This will allow you to control the level of electrical assistance in the simplest way possible: by pedalling!
Press harder on the pedal, and you'll accelerate; press less, and you'll slow down!

4 assistance modes for any situation

Mode 0 - Deactivated
The battery is not used.
Mode 1 - Economy:
Extend your outings by preserving the battery. Ideal for keeping up with other mountain bikers without assistance who are in better shape.
Mode 2 - Standard:
This is the most versatile mode. Climb any slope without getting too tired and without using too much power.
Mode 3 - Boost:
Overcome the insurmountable! Note:Using this mode for an extended time will reduce the length of your ride.


Calmly overcome new obstacles (roots, rocks, gravel, etc.) thanks to the 120mm of travel in the Suntour XCR fork.
Our Rockrider mountain bike team worked with Suntour to design a superior lubrication and wiper seal for this electrically-assisted mountain bike. This ensures the fork stays sensitive over time.


To prevent the chain slipping, the E-ST500 electric bike is equipped with a single SRAM NX chainring with X-Sync technology. Made from steel for greater durability.
An end to confusion:simply change between the 9 speeds using the single shifter on the right handlebar.
In detail:
- Sram X-Sync 32-tooth BCD 94 steel chainring
- Shimano Altus M2000 9-speed rear derailleur
- Shimano Altus M2000 shifter
- KMC x9 chain
- 9-speed 11-36 tooth cassette


These aero trail wheels have been specially designed for mountain biking:
- 23 mm rims for improved durability and good grip on wide tyres.
- a rear wheel with 36 oversized spokes to resist the torque of the motor.

Hutchinson Cougar 2.4" tyres for superior grip

So you feel safe on any terrain and for traction adapted to your motor, the E-ST500 mountain bike is equipped with Hutchinson Cougar 27.5" tyres 2.4" 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 disc brakes:GET A GRIP ON YOUR BRAKING

No matter the conditions you ride in, (dry, muddy, wet), the Hayes MX5 mechanical disc brake callipers on the front and rear provide powerful, progressive braking. Oversized 180mm diameter discs provide even more power.
The Tektro aluminium brake levers are easy to grip, lightweight, and precise.

HANDLEBAR, STEM, GRIPS: Take control with ergonomics designed for women!

With its adjustable stem, the E-ST500 controls are close to hand. Entirely made from aluminium, the 70mm B'Twin stem, designed for women's morphology, can be raised thanks to the 5 adjustment levels:+ 0mm, + 7.5mm, + 15mm, + 22.5mm, + 30mm.
In detail:
- 680mm-wide oversized aluminium handlebars to adapt to the width of women's shoulders.- Soft touch B'Twin sport grips for good grip and a comfortable feel

SADDLE: A comfortable sporty seat, specially designed for women

Since your mountain bike rides will get longer and longer, it is important to have a suitable seat. This is why our teams have designed the exclusive B'Twin Ergofit Women saddle.Adapted to all hip widths, its profile has been specially designed for women.
The 31.6mm aluminium seat post ensures compatibility with most adjustable and suspended saddles on the market.


The E-ST500 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.


22.10kg in S without pedals.
22.20kg in M without pedals.
22.30kg in L without pedals.
The weight can vary based on the tolerance of the components. The bike comes with B'Twin Flat platform pedals.
The total weight (bike + rider) should not exceed 120kg.


Your E-ST500 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, 150mm gap for the rear wheel)
- child seat


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 an 8 mm Allen key for removing your rear motorised wheel.
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.


S : 1M50-1M65: 22.1 kg
M : 1M65-1M75: 22.2 kg
L : 1M75-1M80: 22.3 kg

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Composition / advice

100.00% Aluminium 6061
Stock advice Store the bike in a warm, dry place away from corrosive products and saline atmospheres. We advise recharging the battery at least every 6 months.
Restricted use : Not suitable for All Mountain, Enduro, and BMX.
instructions To get more information about this product, please read instructions

Our commitments

Guarantee : Lifetime (frame, stem, handlebars). Availability of spare parts: 2 years.

Product benefits

Power Overcome any slope with the motor's torque of 42Nm at 250 W.
Autonomy Average ride: 2.5 hours in sports mountain biking use with its 420Wh 36V 11.6Ah.
Smooth pedalling Pedal naturally with its integrated torque sensor. Essential for mountain biking
Cycling comfort You'll love its comfort: raised position, wide tyres, ergonomic saddle
Directional control Good control with the 2.4" tyres, wide handlebars and hydraulic fork.

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E-ST500 Women's Electric MTB
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