Why do cars not use solid tires?

Cars typically do not use solid tires because solid tires provide a harsher ride due to less flexibility and shock absorption compared to pneumatic (air-filled) tires. Additionally, solid tires can be heavier and may not offer the same level of traction and grip on various surfaces. Air-filled tires also allow for better handling and performance, which are crucial for safety and comfort in driving. Finally, solid tires may wear unevenly and are less effective at dissipating heat, leading to potential performance issues.