The Mountain Monster X is a fat bike built with a 6000w front wheel drive system along with a 2000w mid drive system that gives you both speed and hill climbing ability in one bike. each system runs on its own battery. so you are charging up the other battery while riding if the other system is not being used. Plus this beast of a bike has a range of 125 miles per charge at 20mph avg. speed. what all the videos on this bike to see what it really can do. plus you can pedal with the 8 speed internal rear hub for max power.