Originally Posted by prooftheory

If you are just talking about changing the gear ratio at home by flipping the wheel around then that can work but it isn't really that big of a deal to change cogs once you know how to do it. I wouldn't want to have to change my wheel around in the middle of a ride. If you have a fixed/free flip-flop hub one side can be for a free wheel and many people prefer a freewheel for going down hills.