How big are the wheels on first car made?

There's no single answer to the question of how big the wheels were on the "first car." The definition of "car" and the date of the "first car" are both debated. Different inventors created self-propelled vehicles at roughly the same time, and early designs varied wildly.

The wheels on these early vehicles would have been relatively small compared to modern cars, likely ranging from 18 to 30 inches in diameter. However, precise dimensions for many early experimental vehicles are not readily available, and even if they were, the size may have been altered or adjusted during the vehicle's development and testing.