The importance of top 30 pre-draft visits varies from franchise to franchise. For the San Francisco 49ers current regime, they have been a reliable indicator of whom the team will select in a given draft.
Since John Lynch and Kyle Shanahan have arrived in 2017, the 49ers have selected multiple players who they have brought in on an official top 30 visit in each of the six drafts they have conducted.
So, what exactly is a top 30 visit, and why is it such a good tool to gauge who the 49ers will select in a given draft?