Touring bicycles are another special type of road bike. They are designed to be ridden on pavement, but are more durable for use on self-supported long-distance riding. They have all of the necessary mounting bolts for cargo racks and fenders, and although they still have a drop handlebar, they usually have a more relaxed frame design so that the rider is more upright, for more comfort when riding long distances for multiple days at a time. They have a lower gear range compared to regular road bikes, to allow for carrying heavy loads up steep hills. They also make good commuter bicycles, because of their durability and ability to carry heavy loads.