I have an old Cannondale mtn bike frame completly rebuilt with street slick tires. Really like it for this type of trail. Put a 27 sp. drive train and long bar ends to change riding positions. Very good on hard pack limestone even when wet. It is al.frame but no front shock so is pretty light. Have riddin KT trail, Prairie Spirit and took on Amtrak to New Mexico. I like it because it is not a theft hazard and is easy to take on bus or train or throw in back of pickup.
It’s about the ride not the shiney parts.