The Gyronaut X1 set the land-speed record for motorcycles (yes, that's actually a motorcycle), and is actually an offshoot of the Gyron concept above. After scrapping plans to hold a Shelby-built V8, the Gyronaut X1 ultimately set a record of nearly 265mph in the mid-1960s -- a mark that lasted well into the next decade.
Also worth noting: Tremulis' truly exceptional mustache.
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Aaron Miller is the Cars editor for Thrillist, and can be found on Twitter. He'll almost definitely never hit 265mph on a motorcycle.