The tallest unicycle ever mastered is one 35.00 m (114.8 ft) tall ridden by Sem Abrahams (with a safety wire suspended from an overhead crane) for a distance of 8.5 m (28 ft) in Pontiac, MI USA on January 29, 2004.
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Previous records
Sem Abrahams 45 ft (1976)
Sem Abrahams 72 ft (1980)
Steve McPeak 101 ft (disputed)