What's up guys and welcome back to PureFixTV. We're back again with George expert mechanic and rider. What's up George? What's up Amanda? Will you tell me what a flip-flop hub is? Sure it's a hub that has both a freewheel and a fixed gear cog on it. The freewheel is used so you can close for maybe somebody who's just starting and they want to ease into it. Some people like to go directly to the fixed gear which gives you a direct drive chain to where you can pedal forward and pedal backwards and the bike will move with you. Alright so how easy is it to change from freewheel to fixed? It's pretty easy I can show you. First you want to loosen both of the bolts and then you want to take the chain off. Flip it over to the fixed side. Put the chain back around it. And you tighten the bolts up. There you go. That's how easy it is to go from freewheel to fixed. Usually once you go fixed you don't go back. Thank you so much George. You're welcome Amanda. Alright now you guys know what a flip-flop hub is. If you have any questions for George or any of us you can leave a comment below or hit us up on Twitter at PureFixTV. Until next time I'll see you in the streets.