This type of electric bike is designed to go off-road. Mountain bikes usually have higher volume tires with aggressive tread (smaller knobs for gravel roads and packed dirt, larger knobs for soft loose terrain). Most eMTB products have front suspension and many offer full suspension! This improves rider comfort and control, but tends to increase the price and weight of the bike. Most electric mountain bikes have aluminum frames, but the really fancy ones use lightweight titanium or carbon fiber. They are often ranked by toughness, terrain capability, and suspension travel going from cross country (120mm), trail (150mm), all mountain enduro (150mm to 180mm), and downhill (180mm+).