Riders Republic will release on 2nd September, 2021.
While developer Ubisoft stopped short of outlining when the betas will launch, it does, however, invite players to register their interest in trying out the "massive multiplayer outdoor sports playground" via upcoming betas.
Even without details on when the beta tests will go live, players interested in trying Riders Republic ahead of its launch can register their interest now on the official website. Though there's not much information on the website just yet, it does intimate that betas will be available on all platforms Riders Republic is coming to, including Google Stadia.