A rotor assembly for use with size reducing machines having a drive motor comprising a central shaft with a drive end for securement to the drive motor and an opposing outboard end. The rotor assembly also comprises a webbing engaged with the central shaft for supporting the rotor assembly, a rotor casing substantially seals the webbing, and a plurality of sockets secure to a plurality of casing throughbores. The webbing comprises a drive end plate secured to the central shaft with a bushing, an outboard end plate secured to the central shaft with a bushing, and a plurality of web socket supports aligned in two transversely aligned rows. The web socket plates each comprise two socket receiver channels for alignment with the sockets. Finally, a plurality of hammers releasably secure to the plurality of sockets.
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