27.5" Hardtail Electric Mountain Bike E-ST520 - Black/Purple

You have to pedal to go forward!
The electrical assistance supplements your pedalling to help you overcome obstacles. You can enjoy your mountain bike rides for longer, and even out the abilities within a group. Some women even find that the electric mountain bike is what gets them back in the saddle!
The rear motor, with its cadence sensor, stops the electrical assistance when you stop pedalling.
The walking mode compensates for the weight of the bike when you need to put your feet down.

The "women comfort sport" saddle on the women's E.ST 520 is ergonomic: with a hollow centre and sporty design to prevent chafing and irritation for mountain bike rides lasting 3 hours or more.

The 60 mm stem is shorter, as women's torsos are shorter. This prevents an overly horizontal position which may cause back or neck pain. The position can be raised by placing an adapter under the stem.

The fork can be adjusted to your weight
The 680 mm handlebar is narrower

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), comfort (straighter back) and an easier step-through.

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.

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

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 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.

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 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

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

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

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.

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.

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.

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: + 0 mm, + 7.5 mm, + 15 mm, + 22.5 mm, + 30 mm.
In detail:
- 680mm oversize Rockrider Sport aluminium handlebar
- Rockrider Sport "soft touch" ergonomic grips for good grip and a comfortable feel

The bike comes with 520 Grip MTB platform pedals (ref. 8487130) 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 lipless pedals with platforms or wide aluminium platform pedals.

Your E-ST 520 women's mountain bike comes with a bell, lights, wheel reflectors, and pedals.

The frame is compatible with:
- front and rear mudguards
- stand on a base
- bottle cage (on the top tube)
- saddle bag
- rear pannier rack (that fixes to the seat stay or a special one for wide bikes)
- child seat
etc.

Tip N°1:
When mountain biking, there's always the risk of a fall: don't forget to wear a helmet, gloves, and shorts or cycling 3/4 tights with a pad to keep you comfy in the saddle

Tip N°2:
For your first rides, play around with the different electrical assistance modes when you're still close to home.

Tip N°3:
Remember to take a repair kit and 8 mm Allen key for removing your motorised rear wheel.

Tip N°4:
Remember to take a water bottle or hydration pack to drink from

To optimise the durability of the components, we recommend a maximum load of 120 kg (rider, kit + bike).