Zimmerman ultimately left the Vikings for the Broncos in 1993, and stayed with the team from 1993 to 1997. He would be part of the team's first Super Bowl-winning squad, winning the game in 1997 and was "in spirit" for the 1998 season. Arriving as the veteran player in 1993 to an offense that was made up of mostly rookies, Zimmerman became the "de facto" leader of the Broncos offensive line on and off the field. Zimmerman started the Denver offensive line tradition of not speaking to the media. It became a long running tradition that would continue on a full decade after his retirement in 1997. In 2007 the NFL created “The Broncos O-line rule" in response, requiring all players to talk to the media.