sorry, if this is old or if it belongs in cars section, but take a look...
that xrg is actually standing still in SO1 and as u can see wheels do not touch the road surface but float in the air just like in most rfactor mods
of course this can clearly be seen only from such angles so I don't know about other cars and tracks yet - will give them closer look...

It's a known bug. The track surface isn't always at the same place as the textures. It's the some thing when sometimes the tyres sink in to the tarmac.