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Flip-flop hubs, also called double-sided hubs, are rear bicycle hubs that are threaded to accept fixed cogs and/or freewheels on both sides.
There are several different types of flip flop hubs available for different applications. Their main purpose is to allow changing between two different gear ratios on one rear wheel without the added complications of a multi-gear derailleur or internal hub gear, or between fixed and freewheel options. By removing the rear wheel and turning it around, the rider can switch between the two options. They are traditionally found on track bicycles, but can also be found on other single speed bicycles.
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