Bikes, There are many kinds of bikes. There are mountain bikes and bmx/freestyle bikes. Also there is many parts. A fork on a bike is the part in the front that is connected to the frame of the bike and the fork holds the front tire. A frame is the part of the bike that holds the hold bike together technically. The headset on the bike is the part that allows the handle bars to spin to allow the person riding the bike to do tricks like a barspin. The rim on a bike is the part that holds the tires together.