Reminds me I had Raceroom working a couple weeks ago but I think that was in a Windows 10 VM under OpenSUSE — not in Linux Steam directly.
I was thinking of getting raceroom again. I racing got way way too expensive, even when buying during holiday sales. What a rip off iracing is. Plus they no longer worked with windows 7 which left me in the ,urch after having spent so much $$ on iracing - another good one is RFactor2 but mostly for racing agaisnt ai.