Used
Mountain bikes
Mountain bikes are a type of bike specifically designed for off-road riding on rough terrain, they have thicker tires with knobby treads, stronger frames, and suspension systems to absorb shock and improve traction. They come in different styles such as cross-country, trail, enduro, and downhill, each catering to different types of terrain and riding. They come in different materials such as aluminum, carbon fiber, and steel and different wheel sizes, 26 inches, 27.5 inches and 29 inches, each offering different benefits in terms of stability and agility.
Wikipedia