Developed from road bikes, it is suitable for ultra-long-distance self-sufficient travel. It has a more comfortable and relaxed frame geometry design, can bear weight, has a very low minimum gear, uses a wider tire, and the selection of accessories pursues reliability and durability. Too much emphasis is placed on reducing weight, and mountain bike pedals are often used. It evolved for the mountains. Most of them are the same as the mountain but the configuration is more flexible. For example, the handlebar can be replaced with a butterfly shape, which can use many postures to reduce fatigue in a long time. The front fork can also be equipped with or without shock absorption. The wheels can be 700c or 26 inches. But the brakes are generally V brakes. It is convenient to add shelves, tile covers and camel bags. In short, all the changes are to increase durability and reduce fatigue during long distances.
