B'Twin Rockrider E-ST 900 Electric Mountain Bike

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.

Power: Head for the summit powered by a 250W motor with 70Nm torque.

Autonomy: Ride for around 3 hours at a sporty pace thanks to the 500Wh 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.

Which is the right size?: Several sizes available:.

S: 1.55m to 1.64m.

M: between 1.65m and 1.74m.

L: between 1.75m and 1.84m.

XL: between 1.85m and 2.00m. If you are 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 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.

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 conical pivot 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 format thru axles (12x148 rear, 15x110 front) for greater durability. Aluminium hubs with sealed bearings.

TUBELESS READY rims: you will need TUBELESS tyres, specifc 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 grip on the ground. Mounted on wide rims, these tyres provide great 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 31.6mm aluminium seat post ensures compatibility with most adjustable and suspension seat posts on the market.

Platform pedals: 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 clipless pedals with platforms or wide aluminium platform pedals.

Accessories: Your E-ST900 mountain bike is fitted with a bell, lights, wheel reflectors and pedals. Guaranteed for 500 charges.

Weight: S : 1M50-1M65 : 21.9 kg.m : 1M65-1M75 : 22.1 kg.

L : 1M75-1M80 : 22.2 kg.

XL : 1M80-1M95 : 22.3 kg.

B'Twin Bikes

B'Twin are a popular choice of bike in the UK, partly due to their widespread distribution by Decathlon, and partly due to the value they offer. Their bikes are divided into several slightly overlapping ranges, with Triban best known for road and gravel bikes, and Rockrider gaining a reputation for high performing MTBs to suit every budget. Elops largely consist of a range of city bikes, whereas Riverside focus on hybrids. All in all, B'Twin bikes are well worth checking out given the size of their ranges; there's a model to suit most budgets.

Rockrider Mountain Bikes

Rockrider are Decathlon's off-road offerings, comprising of a series of kids bikes and adult hardtails, full suspension steeds and even a handful of high end E-MTBs.

This brand was launched in 2018, when Decathlon decided to split their B'Twin bikes into different genres. In terms of prices, there's something for everyone, with adult's MTBs starting at just over £200 and rising up to high end lightweight race bikes at nearly the £4000 mark.

If you want to ride off-road, and would prefer to buy from Decathlon, then the Rockrider mountain bike range is for you.