A hub with threads on both sides so that the wheel can be reversed for different gearing options.

The basic idea is that the rider can remove the rear wheel, turn it around, and have a different gear in the rear without the aid of freewheel or lockring removal tools.

The most common type of flip-flop hub is a fixed/free hub; that is, a fixed-gear cog on one side and a freewheel on the other. Less common are fixed/fixed and free/free versions.

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