Although Gilmore was born in and represented Belgium, he is the son of Australian racing cyclist Graeme Gilmore and competed with an Australian licence earlier in his career, changing to Belgium on 15 June 1998.

Gilmore is also the nephew of British racing cyclist Tom Simpson.

At the 2000 Sydney Olympics he won a silver medal in the men's madison event together with Etienne De Wilde.

That year, he rode for Danish road bicycle racing Memory Card–Jack & Jones.

This biographical article related to a Belgian cyclist born in the 1970s is a stub.