Assetto Corsa on Twitter: "IMPORTANT NOTE - Oculus Rift users: We recommend launching the game by-passing Steam VR, adding "-vr" to Steam launch options for ACC as described in the below image
Assetto Corsa Competizione VR Setup Guide - Coach Dave Academy
ACC VR - The Definitive VR Performance Guide [SteamVR] | LynxSec Blog
ACC VR - The Definitive VR Performance Guide [SteamVR] | LynxSec Blog