Hydrodynamic radius is a quantity related to intrinsic viscosity, and can be measured in dynamic light scattering measurements. These provide another measure of the molecular size by capturing the Stokes drag radius of an equivalent sphere undergoing the same centerof-mass diffusion as the bottlebrush. We plot this in Figure , which shows that for large M for both values of M sc tested there is nearly quantitative agreement between simulation and experiment. In contrast to intrinsic viscosity, however, both the simulation predictions and the measured values are less sensitive to the molecular changes (i.e. M sc ) and thus provide less insight into dilute solution bottlebrush conformation.