I knew I should add this [0] link too! TL;DR: It had a steel rim and an iron hub. But its center was laminated paper. People had made other kinds of composite

I knew I should add this [0] link too! TL;DR: It had a steel rim and an iron hub. But its center was laminated paper. People had made other kinds of composite wheels. They'd tried wood, but wood reacts to weather. Laminated paper was more stable. Wood can split along its grain. Paper doesn't. [0] https://uh.edu/engines/epi758.htm https://uh.edu/engines/epi758.htm