The drivetrain for almost all geared bikes uses a cassette and derailleur to change gears as you ride. With all-terrain electric bikes, some manufacturers offer the option of an internally geared rear hub. This is a great option for all-terrain electric bikes, since they are usually ridden in more extreme off-road conditions. For the internally geared rear hub, the gears all sit inside an oil bath that’s sealed away from the elements. This makes a geared hub extremely resilient against mud, dirt, sand, snow, brush, etc. with no exposed derailleurs. Gears are shifted via a twist shifter. With an all-terrain electric bike the benefit of the low-maintenance geared hub is nice for your peace of mind. For maintenance, it will require an oil change every 3000 miles or so. For the hunters, it is a much quieter because the internal geared bike uses a carbon belt and the belt is very unlikely to ever drop off.