Cyclist hits 80 mph on custom-built bike with huge crank

08/15/2013 | Popular Science

A British cyclist got some serious speed on his custom-built road bike, reaching 80 mph in a video demonstration. Tom Donhou, a London-based bike builder, relied on a specially designed crankset featuring a chainring with 104 teeth -- more than twice the number found on a standard bike. While Donhou fell far short of the world record of 167 mph reached in 1995, his decision to use a relatively "normal" bike and the souped-up Ford Zephyr that served as his pace car will no doubt secure him a spot, however brief, in cycling fame.

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