So I have been riding single speed and bought a new wheel with a flip flop hub today. I was thinking that I could just take off the old wheel and use my new one and everything would work fine. The problem is that my current chain does not fit the cog that came with the wheel. It seems that my front crank and new rear cog are different. I know this is probably a stupid question but what do I need to make this set up work? Some pictures are below so you might understand better what I am talking about. Thanks!!