Originally Posted by Hassan347
what does a flip flop hub do? and whats the point?
Freewheels screw onto a freewheel hub. To make things easier, a standard size was determined for the threads so all freewheels would fit all freewheel hubs. Unfortunately, about the smallest you could make a freewheel that would fit these hubs was 16 (15?) tooth.
Some people wanted smaller/lighter freewheels so they came out with a smaller thread size that would accept these smaller freewheels (13/14 tooth) and then they put the smaller size threads on the same hubs with the standard sized threads. These hubs were called flip-flop hubs because you could pull off your rear wheel, flip it over, flop it back on, and use a different sized freewheel - on the same bike/wheel!
Very nifty when they were invented.
Today, most people use cassette hubs which allow for much smaller gearing than freewheels could ever do and a much higher quality product than freewheels have ever been. Yet, they tend to cost a good deal more, so there are those who prefer the cost advantage and price advantage that a standard freewheel or flip-flop hub can offer.