World's oldest wheel - photo

[Toolmaker51]

Major design changes since then. This one is flat only on the top. Now they get flat only on the bottom!

Technology marches on!.
Dang, hate how that word creeps into everything, when advertising people lack correct terminology that applies [chemistry - physics - mechanics - biology - etc]

Artifacts between this wheel and now of course are rare. It would be interesting to see how [if] they elevated from wheel turning on a spindle to making the axle active instead. I'd guess a worn axle less time consuming to replace than building a wheel, how they radiused a bearing saddle, or found big square lug washers lol.