I wouldn't use the flimsy step-in posts, rather solid attachments, against a solid wall or chain-link, so the bear has to at least pause rather than just charge through. Mary
The step-in-posts are intended for use in pastures where it is important for the beef or dairy farmer to move and reposition the gazing or cross fences all through the year to maintain a steady supply of grass. In other words part of the pasture has cows grazing on it while a different part of the pasture is recovering or growing the next crop of grass.