REAR 26 x1.75 (559-21) RIM FLIP FLOP FIXIE BIKE WHL SEALED HUB MTB CONVERSIONS | eBay
Flip Flop Hub: Fixed vs Freewheel the Battle Continues!
I want to swap my bike from fixed-gear to single-speed, but I don't think my rear wheel has a flip-flop hub. What do I need to buy to achieve this? : r/bikewrench
Free to Fixed: What is a Flip-Flop Hub and Why do you want one? - YouTube
Brand New Single Speed Fixed Gear Fixed Road Bike Flip Flop Hub Bicycles | eBay