My thoughts on this subject. The RSTD does not have the fairing with all the weight of the RSV and the trunk and CB radio under it. I am not sure but think that the RSTD is a little lower also. Just those will cause a lot of differences in acceleration and cornering. They both have the same motor, tranny and rear gear unless the PO changed the gearing to a V- Max gear in the RSTD.