Adams competed at six consecutive Summer Paralympics from 1988 to 2008, winning a total of three gold, four silver, and six bronze medals. At the 1988 Summer Paralympics he won two bronze medals, one in the 800m race and one in the 1500m race. Four years later at the Barcelona Games he won two silvers, one in the 800m race and one as part of the 4 × 400 m relay. At the 1996 Summer Paralympics he won gold in the 800 m, silver in the 400 m, and bronze in the 4×400 m relay. Four years later, at the Sydney games, he won five medals, a gold in the 800 m and 1500 m, a silver in the 400 m and a bronze in the 5000 m and 4x100 m. At the 2004 Paralympics he won a bronze in the 400 m race. Adams was coached by Peter Eriksson.
Adams underwent radiation therapy for cancer as a child, and aftermath of the treatment led to a spinal injury at age 9 that paralysed him. After retiring from competition, Adams and business partner Christian Bagg co-launched Marvel Wheelchairs with Cervélo Cycles, producing adjustable wheelchairs for everyday use. After Cervélo was unable to secure bridge financing for debt to suppliers, Marvel was taken over and unsuccessful attempts were made to sell it by Cervélo. Cervélo was taken over by PON, and Adams and Bagg launched a new company making wheelchairs called ICON in 2010. An appearance on the CBC reality show Dragons' Den led to a new partnership with a manufacturer, Multimatic, to produce the wheelchairs designed by ICON.
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