Post long ago but thought I would try Ride on the edge 2 on my Steam Deck. Works really well dispite saying its not supported. Even rumble when accelerating and braking works. Medium/high details gets around 50-60 fps and looks and plays niceTT Isle of Man Ride on the Edge 2 is one hell of an addictive game. The immersion of speed really is something. MotoGP 21 has the best bike physics. Ride 4 seems to have the worst physics as apparently it got dumbed down because people were complaining it's too hard. Though Ride 4 has a great selection of tracks and riding at night with all the headlights on.
The best part of the TT game is you can feel the rumble on the triggers for braking and accelerating for the Xbox Elite controller.