The gears are there to enable us to maintain a comfortable pedalling speed (or cadence) regardless of the gradient or terrain. Front and rear disc brakes ensure your safety, thick and durable tires, double shock absorption. The battery is super-secure while riding and easy to remove, it can be charged at any household outlet on or off the bike. The powerful 250W/350W motor provides the best performance under pneumatic tires, adapting to more bumps, no pressure 25° climb. Anti-skid anti-vibration tires, wear-resistant anti-skid tread and high-quality shock absorber to help you unimpeded.The battery pack is the core of the electric bicycle. It uses an advanced removable lithium-ion battery pack. Excellent battery life is not afraid of high load and durability. With the perfect combination of professional 21 shifter gears (three chainrings at the front and seven sprockets at the rear). Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. We ONLY accept the return for original package. Please make sure that item has NO man-made sabotage. Used items will not be accepted for return. You bought wrong model or wrong color. We promise to help you solve it asap, and make you feel satisfactory absolutely. The item "Electric Mountain Bike 21 Speeds Shifter Adult E-Bike Front and Rear H1PS" is in sale since Monday, December 28, 2020. This item is in the category "Sporting Goods\Cycling\Electric Bicycles". The seller is "hivepeeks" and is located in Hacienda Heights, California. This item can be shipped to United States.