Basically, RVIZ only draws up to the inscribed radius of the robot, which is independent of the inflation radius.

On Mon, Sep 6, 2010 at 12:45 PM, Christian Verbeek <verbeek@servicerobotics.eu> wrote:

I found that if I use an inflation_radius > 0.55 (the default in in
costmap_2d) the inflated obstacles are displayed in rviz as if I used 0.55.

I set the inflation_radius to 1 and see no difference in rviz compared
to 0.55. The robots behaviour seems to honour the 1.

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