<P> A fork end, fork - end, or forkend is a slot in a bicycle frame or bicycle fork where the axle of a bicycle wheel is attached . A dropout is a type of fork end that allows the rear wheel to be removed without first derailing the chain . </P> <P> Track bicycle frames have track fork ends, on which the opening faces rearwards . Because they do not have dropouts, the chain must be derailed from the sprocket before the rear wheel can be removed from a typical track bike . Some single - speed bicycles intended for street or trail use are also equipped with track fork ends instead of dropouts . </P>

What is the end of the fork called