Nothing crazy. Tires, tubes, seat, pedals, grips, cables, clean/lube. The usual stuff for an old, worn out bike. Bro-in law is an old fart like me, and says he's had this rig since his college days...so I'm thinking he won't want to repaint it. I'm recommending the Kenda City Slick Mountain tire rather than knobbies, as he ain't gonna be doing any rad trail stuff. Other than that, I'm thinking keeping it as it is.They are solid bikes with tons of potential. In what direction are you planning to take it?