• It is possible to get an 8 speed screw for freewheel hub I have seen them on e-bay but I would not recommend this course of action. This is because one of the reasons Shimano went to free hubs i.e. the ratchet mechanism in the hub was that a weakness of 7 speed screw on freewheels was that the distance between the bearings and the frame was too big. This meant 7 speed freewheels hubs often get broken axles. However you will find that an 8 speed changer will work for 7 speed jus minus one gear stop

    Zebs

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