In Figure (a), we plot the radius of gyration for a series of bottlebrush molecules of varying M bb and M sc . Similar features are seen in the quantity R 2 g as in [η], with a regime where the "star-like" molecules at low M bb do not increase rapidly with added M bb because the addition of branches to make a more-armed star is the main effect of adding another backbone monomer. To show how this occurs, we also plot the R 2 g of the backbone specifically in Figure , and show that this value is significantly smaller than the overall molecule size at M bb < 10 4 Da. However, at large values of M bb the backbone begins to track very closely with the overall size of the overall R 2 g , meaning that additional M bb is the main contributor to the size trends of the molecule. We further note that the increase in side-chain length can affect the backbone in this limit, with a scaling exponent as shown in the inset of Figure . This exponent increases from the ideal value 2ν ≈ 1.2 to a larger scaling value indicative of the stiffening effect of the long side-chains. Nevertheless, this remains significantly less than the rod-like limit 2ν < 2 reflecting the wormlike structures seen in Figure . Additional plots for radius of gyration as well as for R g /R h are provided as Supporting Information.