By smoother I mean, your driving along and the nr side wheel goes over a drain/ man hole cover/ lump in road/ pot hole.
and car would go bump bump. (Without roll bar) (front OR rear)
but with the roll bar (either front or rear) it is more of a bang bang. Where you hear the change in the door pocket jump . Like you've fitted stiffer springs!
guess it's because without the roll bar all the impact from the road ie, pot hole is directed at that wheel. But when the bar is fitted!, it tries to divert/ share the effect across the bar to the other side wheel. Making it seem/feel more dramatic.
Just made the car feel stiffer. There for exaggerates any imperfections in the road.