B'Twin Rockrider E-ST500 27.5" Electric Mountain Bike

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The B'Twin Rockrider E-ST500 27.5" Electric Mountain Bike features an aluminium hardtail frame with front suspension for MTB riding, 9 speed Altus disc groupset (1 x 9), 27.5" wheels, weighing 22.1kg and is finished in black & blue.

B'Twin Rockrider E-ST500 27.5 E-MTB

  • B'TWIN Men's Alloy Hardtail E-Bike Frame with Front Suspension
  • 27.5" Disc Brake Wheels
  • 9 Speed (Altus Groupset - 1 x 9)
  • Available in S in Black & Blue.
  • Designed for MTB riding.
  • Weighs 22.1kg

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

With the E-ST 500 electric mountain bike (EAMTB), you will enjoy natural pedalling. The built-in torque sensor provides subtle proportional assistance so you can keep going for longer.

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 by +300%, 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: We created this E-ST 500 mountain bike at our B'TWIN VILLAGE (Lille, France) especially for mountain biking enthusiasts. We have designed and tested the bike E-ST 500, involving riders at every stage of the project.

STURDY, PLAYFUL FRAME: The frame of the Rockrider E-ST500 EAMTB 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 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.

LG OR SAMSUNG BATTERY CELLS: 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".

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.

TORQUE SENSOR FOR NATURAL PEDALLING: How do you control your speed, particularly on technical sections? We have integrated a torque sensor into the bottom bracket of the E-ST500 EAMTB.

This allows you to control the level of electrical assistance in the simplest way possible: by pedalling!. If you push harder, you accelerate; if you push less, you'll slow down.

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

Mode 1 - Economy +50%: Extend your rides while conserving battery life.

A perfect helping hand for small gradients.

Mode 2 - Standard +150%: This is the most versatile mode. Climb any slope without getting too tired and without using too much power.

Mode 3 - Boost +300%.

120 MM FRONT SUSPENSION: Calmly overcome new obstacles (roots, rocks, gravel, etc) thanks to the 120mm of travel in the Suntour XCR hydraulic 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.

SINGLE CHAINRING DRIVETRAIN: The E-ST500 electric bike is equipped with a single chainring and SRAM X-SYNC anti-drop technology to prevent chain drops. A single shifter on the right handlebar makes it easy to shift between the 9 speeds.

In detail: Sram X-Sync 32-tooth chainring. Shimano Altus M2000 9-speed rear derailleur. Shimano Altus M2000 shifter with gear indicator.

Shimano Altus 9-cog 11-36 cassette. KMC X9 chain.

WIDE 27.5" DOUBLE-WALLED RIM WHEELS: These wheels were specially designed for this mountain bike: 19 mm rim with 28 spokes at the front.

23 mm rim (distance between flanges) with 36 oversize spokes at the back for more sturdiness and a good hold on wide tyres up to 2.5". Cone hub with bearings (easy to maintain) at the front. Sealed motor bearings at the rear.

- TUBELESS compatible at the rear: you'll need rim tape, a TUBELESS tyre, a PRESTA valve and tyre sealant.

HUTCHINSON TYRES: 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" x 2.4" tyres. Our test riders particularly liked these tyres for their good grip.

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

MECHANICAL DISC BRAKES: No matter the conditions you ride in, (dry, muddy, wet), the Hayes MX5 cable-operated 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 500 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 have a suitable seat. So our teams designed the exclusive ROCKRIDER Ergofit Evo saddle.

It fits all hip sizes and has a curved shape that is particularly good for sport trail rides. The 31.6 mm aluminium seat tube ensures compatibility with most dropper and suspension seat posts on the market.

PLATFORM PEDALS: The E-ST500 electric bike is supplied with ROCKRIDER Flat platform pedals.

The pedal surface is wider and the dots more pronounced to better keep the foot on the pedal.

Weight: S - 150-164cm: 22.1 kg.

M - 165-174cm: 22.2 kg.

L - 175-184cm: 22.3 kg.

XL - 185-200cm: 22.4 kg. Weight without pedals.

.. more details.

E-ST500 27.5 E-MTB Specification

Bike TypeElectric Bikes
Frame MaterialAlloy
Frame TypeHardtail
Fork TypeSuspension Fork
Brakes TypeDisc Brakes
Number of Gears9 Speed
ChainringsSingle Chainring
Cassette9 Speed
Wheel Diameter27.5"
ColourBlack & Blue
Designed forMTB
Lowest Price£1299.99

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