Having an issue with motion blur. The cars are moving and the tires are spinning. When motion blur is off, the wheels touch the ground, when motion blur is on they appear to not touch the ground.
you likely need more geometry samples. fast spinning items need more.
That’s likely something left over in the animation.
As Daniel said, try and increase the geo subdivisions for the wheels alone (in the v-ray properties), but also ensure the animation is clean: motion blur will consider sub-frames as well, and will reveal any jitter hitherto invisible.
Thanks guys, more samples seems to have fixed the issue.