Final answer:
Symmetrical wheel rims feature a center that allows car tires to be mounted and demounted from either side, facilitating easier and quicker tire changes.
Step-by-step explanation:
The type of wheel rim that features a symmetrical drop center, allowing a car tire to be demounted and mounted from either side, is known as a symmetrical rim. This design is particularly useful for tire servicing as it simplifies the process, making it easier and quicker to change tires. The drop center of the rim provides a recess that gives the tire beads a place to rest during the mounting or demounting process; because it is symmetrical, this feature is accessible from both sides of the rim, which is not the case with asymmetrical designs that have different profiles on each side.