The Horse Farm Hundred 25 Oct up near Gainesville offers a similar option. As long as pre-registered you can start at either the Gainesville start location at the Loften High School or in Flemington at the County Park where the 25, 30, and 45 mile routes of the
Horse Farm Tours start at and just stay on the loop. Makes it a lot more convenient for those of us coming from further south. Just have to accept the risk that some of the last rest stops may be closed if you ride sloe and go that way.