At the end of the 1986–87 season, Väsby achieved one of the greatest upsets in the history of Swedish hockey by achieving promotion to the top division of Swedish ice hockey. The team's time in the top league would be short however, as the team finished last in the first round of the following year's Elitserien season and were sent down to the Allsvenskan spring series after Christmas, where they failed to re-qualify for the following Elitserien season and were ultimately relegated to the second tier league.