Fat Tire bicycles are used for riding over the
soft and unstable surfaces such as snow, sand or mud. They are also known as
fat bikes or wide tire bikes. These are typically designed with over sized
tires and wider rims. These make the tire grip the ground with extra width and
enable the rider to float more easily over the unstable terrain. That said the
added smoothness from these tires have people buy them who are just riding on
the road as well.