The Z4 is a top of the range e-bike featuring front and rear adjustable suspension, folding aluminium 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. Just select how much help you want from the electric system using the easy selector, start pedaling and the motor will assist. Please note with this new version the maximum speed the bike will go without moving the pedals forward is 6km/h.Other features include kick stand, battery life indicator, battery lock and rust resistant chain. Foldable BicycleFolds easy transportation and storage Quick Release SeatpostSpring loaded for added comfort and smooth ride Quick Release Front WheelMinimising folded space for storage or transit, and for ease of road side repairs Aluminium Folding FrameLithium battery in frame for protection, with patented locking mechanism Electric MotorRear mounted 250W brushless motor Battery LEDLED battery charge indicator Brake Lever & PASSmart 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, Wavy Brake DiscsWavy drilled front & rear brake discs, with front anodized aluminium red hub SuspensionPreload & lockout on front suspension Large 26\" WheelsWith off road ready tyres Shimano Gear System21-speed Shimano gears and derailleur