A little known facet of this is that chariots only had to exist because horses had not yet been widely bred to the size and strength needed to carry a fully loa

A little known facet of this is that chariots only had to exist because horses had not yet been widely bred to the size and strength needed to carry a fully loaded soldier with armor on horseback. Following on that, the need for chariots was the impetus for some early iterations of reinventing the wheel, because the required attributes of chariot wheels were so demanding (light, strong, quick to repair) compared to earlier wheels used for traditional use cases at the time.