Dynamic light scattering and sedimentation velocity measurements were performed on dilute benzene solutions of poly(macromonomer) with poly(methyl methacrylate) (PMMA) as the backbone chain and polystyrene (PS) as branches to obtain the diffusion coefficient D and the sedimentation coefficient s, respectively. Dependences of D and s at infinite dilution on the backbone chain length as well as the branch length were found to be quantitatively described by the prolate ellipsoid model with values of the main and the minor axis calculated from the planar zigzag PMMA backbone and the gaussian PS branched chains, respectively. Application of the wormlike cylinder model gave the Kuhn’s statistical length lambda(-1) similar to 90 nm, which is substantially larger than lambda(-1) = 3.2 nm of homo-PMMA. The concentration coefficient of D and s also showed unique dependences on the backbone chain length as well as the branch length.