It became a member of the Royal Belgian Football Association in 1895 as Racing Club de Bruxelles and later received the matricule n°6.
It took part in the first Belgian league the same year and won 6 titles and 1 cup until the First World War.
Due to increasing financial hardships which were further compounded by heated discussions with the La Rhodienne management about ideas of a merger, Racing's management decided to formally merge the club with La Rhodienne (through switching matricule numbers) in 1963 (see next section).
The team started to compete in the third regional division in 1929, where it immediately won its league.
On the next day, K. Sport Sint-Genesius-Rode (matricule n°1274) changed its name to Royal Racing Club de Bruxelles.
On 23 June, the club wearing the matricule N°6, which had just been renamed to Royal FC La Rhodienne, now changed its name to K. Sport St-Genesius-Rode.