Sem Abrahams first rode the worlds tallest unicycle at age 14. The unicycle was 45 ft tall and built by his father.	Three years later he set a new record at 72 ft for the 'Challenge the Guinness' tv show in Tokyo, Japan.	The Guinness book of world records recognizes Steve McPeaks record of 101 ft despite protests from unicyclists that his was not a bona fide ride as his cycle was held up by a cable.	On January 29, 2004 Sem Abrahams will attempt to ride a unicycle 115 ft tall at the Pontiac Silverdome in Pontiac, MI. The new cycle stands as tall as his previous two cycles stacked on top of each other.