This Bikfun mountain bike has battery assistance for when the terrain gets tough. It has mechanical rear and front brakes with a 21-speed Shimano gear system which helps its climbing ability. The 36v 8Ah lithium ion battery has a 250w motor which means that it can go 15-30 miles at a maximum speed of 25 km/h. The frame is also foldable and made of light aluminium which means that it can be easily stowed away, put onto public transport or carried in the boot of a car. The three modes of normal, electric and power assist means you have something for every circumstance.