B'Twin Rockrider E-ST 520 27.5" Ladies Alloy Hardtail Electric Mountain Bike

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B'Twin Rockrider E-ST 520 27.5" Women's E-MTB

  • B'TWIN Ladies Alloy Hardtail E-Bike Frame with Front Suspension
  • 27.5" Disc Brake Wheels
  • 9 Speed (Microshift Groupset - 1 x 9)
  • Available in L in Black.
  • Designed for MTB riding.
  • Weighs 22.5kg

This electric mountain bike is designed for MTB rides in the mountains.

With the E-ST 520 electric mountain bike (EAMTB), you can tackle any climb with the help of its built-in motor (70 Nm torque). A Frame For Sturdiness And Fun. The frame of the Rockrider E-ST 520 women's bike has been made from 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 both 2.4" tyres and 27.5" wheels while still keeping the bike easy to handle. We've kept the frame geometry low to make sure that the bike stays comfortable to ride.

Motor With 70nm Torque.

The BROSE T Aluminium central motor is specially designed for 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. What Battery Does It Use? Our battery is equipped with battery cells from LG or Samsung, (LGC-MG1 or SDI), which are known 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. There is also a lock in case you want to stop your battery getting stolen. For example, if you park your bike in the street.

3 Assistance Modes: Mode 0 - Deactivated. The battery is not used.

Mode 1 - Economy +60%: Extend your rides while conserving battery life.

Ideal when you want a little push on small gradients.

Mode 2 - Standard +120%: This is the most versatile mode. Climb any slope without getting too tired and without using too much power.

Mode 3 - Boost +320%. A simple, ergonomic control screen. A discreet LCD control screen.

It is located just to the side of your left grip, so you can choose between the 3 assistance modes without letting go of the handlebars: (Deactivated), Economy, Standard, and Boost.

You'll also find a host of useful information: Stopwatch. Current speed.

Average speed. Maximum speed. Distance covered.

Total distance. Battery level. Remaining battery life (in km).

Pedestrian assistance mode. Reset. Rockshox Front Suspension.

Ride over obstacles (roots, pebbles, stones, etc.) easily thanks to the Rockshox XC30 hydraulic fork with 120 mm of travel.

This fork has: A coil spring for maximum sensitivity and reliability - a lockout and rebound adjustment for better control, depending on the terrain.

Drivetrain: The E-ST520 electric bike is equipped with a single chainring and ChainFlow 3D anti-slip technology to prevent the chain from derailing.

A single shifter on the right handlebar makes it easy to shift between the 9 speeds.

In detail: -Chainflow & Anti-derailment single chainring with 34 teeth. Microshift Advent 9-speed rear derailleur with long cage.

Microshift Advent right shifter. Microshift H093 9-speed cassette (11 to 42 teeth). KMC E9 Sport electric bike specific chain.

27.5" Wide Double-Walled Wheels: These wheels were specially designed for this mountain bike: 23 mm rims (width between brackets), 28 spokes at the front and 32 spokes at the rear, for greater durability and good grip with wide tyres (up to 2.5"). BOOST thru rear axle (12x148) for greater durability. Aluminium hubs with sealed bearings.

TUBELESS READY rims: you will need TUBELESS tyres, specific Presta valves, and puncture sealant.

Hutchinson Tyres: In order for you to feel safe on any terrain, and for traction suited to your motor, the E-ST520 electric MTB is equipped with Hutchinson Gila 27.5" tyres with a 2.4" cross-section. Our test riders particularly liked these tyres for their grip on the ground.

Mounted on wide rims, these tyres provide great grip, traction, and comfort on any terrain.

Hydraulic Disc Brakes: Regardless of the conditions you ride in (dry/wet/muddy), the hydraulic Tektro TKD88 disc brakes at the front and rear provide powerful and progressive braking. Oversized 180mm diameter discs provide even more power.

Handlebars, Stem, Grips: The adjustable stem brings the E-ST 520 controls to your hands.

The all-aluminium Rockrider 60 mm stem can be raised to 5 heights: + 0mm, + 7.5mm, + 15mm, + 22.5mm, + 30mm.

In detail: - 680mm oversize Rockrider Sport aluminium handlebar.

Rockrider Sport "soft touch" ergonomic grips for good grip and a comfortable feel.

Platform Pedals: The bike comes with 520 Grip MTB platform pedals with a wider pedalling surface and more pronounced dots for better grip on the pedal.However, if you are looking for improved performance when pedalling and better control of the bike when cycling, we recommend replacing them with clipless pedals with platforms or wide aluminium platform pedals.

Weight: 22.5kg without pedals.

.. more details.

Rockrider E-ST 520 27.5" Women's E-MTB Specification

Bike TypeElectric Bikes
Frame Material
Frame Type
Fork Type
Brakes Type
Number of Gears
Wheel Diameter
Designed for
Lowest Price£1699.99

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