Touring bicycles require equipment that will get you there and support you until you get back. It could be argued I suppose, that any bicycle could be used for touring. There are possibilities like a road bike or a racing or mountain or fixee or track bike. But when it comes down to it, a sturdy road bike is really what one needs to transport oneself, forty pounds of
camping and personal gear,
across cobblestone streets, or down bumpy mountain passes, or through muddy side roads. Peruse this typical
of all the things one might need on a touring trip. It all starts to weight a lot when put into the panniers.