Fat bikes are mountain bikes with wide-rimmed wheels and “fat” approximately 4-inch tires. Because the tires are so wide, they can be run with very low air pressure. As a result, they can be ridden on snow or sand. They can also be ridden like a regular mountain bike on single track. Because many kids bikes don’t have suspension, the fat tires can also be nice because they provide a little extra cushioning.we ks venture , kids fat bike supplier in Delhi, kids fat bike supplier in karolbagh.