Overall, our results show that NMR measurements performed from a CG model lead to an offset in the value of R 1 . In the case of the PEG molecules considered here, there are two major differences between AA and CG calculations, the first difference is the absence of intramonomer contribution R R-bead 1 in CG calculations, and the second difference is the mismatch of both R R-chain 1 and R T 1 induced by the modified distances between the spin carriers.