In this paper we show that the same freezing-melting miscibility gap can be identified for suspensions of spherical polymer particles of radii 138-440 nn sterically stabilized in all cases by the same coating of a different polymer. Diffusion coefficients and sedimentation velocities of the colloidal fluid at the freezing concentration scale with that power of the particle radius expected for hard spheres. These observations demonstrate that these suspensions constitute a good experimental representation of the ideal hard-sphere system.