I've found that just about any car can carry two bikes inside if you take off the bike wheels. One can fit in the trunk along with the wheels and the other in the back seat. My road bikes are both 60 cm frames and they fit easily in either position in a Toyota Corolla or similar size sedan. Have some plastic sheeting or other material to keep any grease or dirt off the car interior - and I try to do the bike loading out of sight of the rental agency to avoid any objections.