Z4 21-Speed Folding Electric Mountain Bike 26″Black


The Z4 is our top of the range e-bike featuring front and rear adjustable suspension, folding aluminum frame with patented safety lock and 21 speed Shimano gearbox.

Like the Z6 this is a fully capable mountain bike but this one has the benefit of being able to be folded up for convenient storage and transport. As the frame can be folded it means the lithium battery can be stored inside keeping it safe and dry.

During the week take advantage of the electric power system to nip around at a fraction of the cost of a car or motorbike and then at the weekend hit the trail for some off road fun.

The brushless motor has plenty of power and will push the bike to the UK maximum legal speed of 25KM/H making it totally road legal. The intelligent throttle system makes operation very easy. Just select how much help you want from the electric system using the easy selector, start pedaling and the motor will assist. Alternatively use the twist throttle to engage the motor like using a motorbike.

Other features include kick stand, battery life indicator, battery lock and rust resistant chain.

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Folded size: 1020mm long x 400mm wide x 900mm high

The battery can be easily removed to lighten the weight.

Smart brakes which cut power to the motor when applied, making sure you get the most distance out of your battery life, and
pedal assist system with level selector.

Folds easy transportation and storage

Quick Release Seatpost

Spring loaded for added comfort and smooth ride

Quick Release Front Wheel

Minimising folded space for storage or transit, and for ease of road side repairs

Aluminum Folding Frame

Lithium battery in frame for protection, with patented locking mechanism

Electric Motor

Rear mounted 250W brushless motor

Battery LED & Throttle

LED battery charge indicator and variable speed twist throttle

Brake Lever & PAS

Wavy Brake Discs

Wavy drilled front & rear brake discs, with front anodized aluminium red hub


Preload & lockout on front suspension

Large 26" Wheels - With off road ready tyres


Rear mounted kickstand for easy parking


Front & rear adjustable mudguards

Aluminium Alloy Frame

Making it lightweight yet durable

Shimano Gear System

21-speed Shimano gears and derailleur

Full Online Spare Parts Backup

As with all bicycles, a Zipper e-bike must be used and maintained properly in order to function correctly. Please read the instruction manual carefully before attempting to assemble and use the bike, as it contains vital safety information to ensure the continued performance. If you have any queries, please feel free to contact our customer service department.

Manufacturer: Zipper Bikes

Engine / Motor Size: 250W

Deck Material: Aluminum

Fuel Type: Electric

Fuel Consumption: No

Fuel Tank Capacity: No

Max. Range: Around 40km depending on weight and motor use.

Battery: 36V 9AH Lithium

Charge Time: 6-8hrs

Max. Speed: 25KM/H

Front Brakes: Front disc brake (160mm disc)

Rear Brakes: Rear disc brake (160mm disc)

Front Suspension: Aluminum suspension fork. Suspension is lockable and adjustable.

Rear Suspension: Rear pivot suspension

Front Tyres: 26 Inch

Rear Tyres: 26 Inch

Starting System: No

Ignition: No

Transmission: 21 Speed Shimano gearbox

Wheel Base: 1600mm

Net Weight: 25.5kgs

Engine Type: No Engine Bore x Stroke: No

Compression Ration: No

Drive Train: No

Recommended Age: 14+ Years if used without supervision & 120kg max load

License Requirements: Zipper e-bikes meet the 'Electrically Assisted Pedal Cycles' (EAPCs) requirements and are therefore classed as normal pedal bikes. This means you can ride it on roads, cycle paths and anywhere else pedal bikes are allowed without a license or tax.Packing Info:Around 30 minutes minor assembly required. Download instructions for more information.

Extra Info: Electric bike may arrive with slight blemishes or minor scratches from transit. We cannot replace bikes for this reason. Please be aware of this before purchase.

Additional information


Black, White