History: 1917. A close-up of the steel spring tire, created as a substitute tire because of a shortage of rubber in Germany [1024x725]

https://i.redd.it/zqz8l4vbz4701.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/7n4kxp/1917_a_closeup_of_the_steel_spring_tire_created/?utm_source=ifttt