B'Twin Rockrider E-ST 100 27.5" Electric Mountain Bike

  1. Cycling Deals
  2.  > 
  3. Bikes
  4.  > 
  5. Electric Bikes
  6.  > 
  7. B'Twin Rockrider E-ST 100 27.5" Electric Mountain Bike

The B'Twin Rockrider E-ST 100 27.5" Electric Mountain Bike features an aluminium hardtail frame with front suspension for MTB riding, 8 speed Microshift disc groupset (1 x 8), 27.5" wheels, weighing 22.5kg and is finished in black & blue.

B'Twin Rockrider E-ST 100 27.5 E-MTB

  • B'TWIN Men's Alloy Hardtail E-Bike Frame with Front Suspension
  • 27.5" Disc Brake Wheels
  • 8 Speed (Microshift Groupset - 1 x 8)
  • Available in S & XL in Black & Blue.
  • Designed for MTB riding.
  • Weighs 22.5kg

This 27.5" electric MTB (EAMTB) is designed for MTB rides with lots of climbs and descents.

With the E-ST 100 electric mountain bike (EAMTB), enjoy (or relive) your first MTB thrills. The smart electric assistance, driven by a cadence sensor and a control screen, helps you find your pace.

WHAT SIZE MOUNTAIN BIKE TO CHOOSE?: Several sizes available: S: between 1.50m and 1.64m.

M: between 1.65m and 1.74m.

L: between 1.75m and 1.84m.

XL: between 1.85 m and 2.00 m.

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).

IS ELECTRIC MTB A SPORT?: You have to pedal to go forward!.

The electric assistance boosts your pedalling with its 250W motor, 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 100 electric mountain bike at our B'Twin Village in Lille, France. We designed and tested the bike E-ST 100 MTB while involving riders at every stage of the project.

We want you to have nothing but fun when you go mountain biking.

STURDY, PLAYFUL FRAME: The frame of the Rockrider E-ST100 electric MTB is made of 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 42NM TORQUE: The motor on the rear wheel was co-developed with VISION for mountain biking: a torque of 42Nm to overcome any slope, a 150x12mm hub to stand up to rough terrain and sealed bearings to withstand the weather, which can often be tough when mountain biking.

What if you get a puncture? 8 Mm Allen key a needed to unscrew the wheel nuts. This tool is available in our 900 multi-purpose tool/bike multi-tool.

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 stops the battery getting shaken when you go adventuring 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.

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 3 assistance modes available: (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 range (in km). Active assistance mode. Reset.

3 ASSISTANCE MODES: Mode 0 - Deactivated. The battery is not used.

Mode 1 - 20 to 100 W: Extend your rides by preserving the battery.

A perfect helping hand for small gradients.

Mode 2 - 80 to 175 W: This is the most versatile mode. Climb any slope without getting too tired and without using too much power.

Mode 3 - 150 to 250 W: Get the most out of your bike in the most demanding situations.

100 MM FRONT SUSPENSION: Calmly overcome obstacles (roots, rocks, gravel, etc) thanks to the 100mm of travel in the Suntour XCR 30 fork. Its design, based on a mechanical spring, is reliable and easy to maintain.

It features U-Fit (weight adjuster) technology so that you can easily adjust the stiffness, based to the rider's weight, using a dial.

SINGLE CHAINRING DRIVETRAIN: The E-ST100 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 8 speeds.

In detail: ChainFlow anti-derailment 33-tooth chainring. MICROSHIFT M25 8-speed rear derailleur. MICROSHIFT TS39 right shifter with indicator.

MICROSHIFT H081 8-cog cassette (11-34 teeth). KMC Z7 chain.

WIDE 27.5" DOUBLE-WALLED RIM WHEELS: These wheels were specially designed for this mountain bike: 23 mm rims (width between brackets), 28 spokes at the front and 36 oversize spokes at the rear, for greater durability and good grip on wide tyres (up to 2.5").

Cone hub with bearings (easy to maintain) at the front. Sealed motor bearings at the rear.

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

TYRES: So you feel safe on any terrain, and for traction suited to your motor, the E-ST100 MTB is equipped with exclusive Rockrider All Terrain Light (30 TPI) tyres with a wide 2.2-inch cross-section. Our test riders particularly liked these tyres for their good grip Mounted on wide rims, these tyres, and the rubber they are made from, provide great grip, traction, and comfort on any terrain.

MECHANICAL DISC BRAKES: No matter the riding conditions (dry, muddy, wet), the Tektro TKD68 180 mm mechanical disc brakes at the front and rear provide powerful, progressive braking.

Incompressible cable housing ensures a firm touch and perfect transmission of power from lever to disc.

HANDLEBARS, STEM, GRIPS: The adjustable stem brings the E-ST 100 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 Evo saddle. Suitable for all hip sizes, the "hammock" shape is particularly good for sporty rides. The 31.6 mm aluminium seat post ensures compatibility with most adjustable and suspended saddles on the market.

PLATFORM PEDALS: The E-ST100 electric bike comes with ROCKRIDER Flat MTB platform pedals. The pedal surface is wider and the dots more pronounced to better keep the foot on the pedal.

ACCESSORIES: Your E-ST100 mountain bike is supplied with a bell, lights, wheel reflectors and pedals.

Weight: S - 150-164cm: 22.5 kg.

M - 165-174cm: 22.5 kg.

L - 175-184cm: 22.5 kg.

XL - 185-200cm: 22.5 kg. Weight without pedals... more details.

E-ST 100 27.5 E-MTB Specification

Bike TypeElectric Bikes
Frame MaterialAlloy
Frame TypeHardtail
Fork TypeSuspension Fork
Brakes TypeDisc Brakes
Number of Gears8 Speed
ChainringsSingle Chainring
Cassette8 Speed
Wheel Diameter27.5"
ColourBlack & Blue
SizeS & XL
Designed forMTB
Lowest Price£999.99

Electric Bike Deals

Why not check out my speedy electric bike deals?!

Or why not see all of my electric bikes deals.

Electric Bikes are the perfect solution for those who love cycling, but need that extra assist on the hills. This form of bicycle makes cycling possible again for less able riders, or for those who wish to take it a little easier, who otherwise might struggle to get out for a ride. Alternatively if you're more interested in more traditional pedal powered transport, please view my Road Bikes and Mountain bikes.

About Cycling Bargains!

Welcome to Bike Bargains - I scour the internet trying to find the best deals specifically for UK based cyclists. Over the years I've saved hundreds of pounds on cycling gear, simply by shopping around and buying cycling consumables only when they're on sale. Whether you're a road cyclist or a DH mountain biker, I handpick the best money saving cycling related bargains I can find - and will hopefully save you money too! Bike Bargains is a participant in the Amazon EU Associates Programme, an affiliate advertising programme designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.co.uk. All details are believed to be correct, but please check with the retailer prior to buying - deals and specifications change, and your contract is solely with the retailer.

You can get in touch with me, or read my Cycling Guides or Privacy Policy.

Thanks in advance, and Happy Shopping!

Hope this helps to save you some money!

Claire x