The Boston Celtics had a defensive rating of 106.3 with Larry Bird between the 1979-80 and 1987-88 seasons.

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celtics defensive rating with larry bird between 1979-80 to 1987-88
Boston CelticsBoston Celtics312106.3241.1114.,23035,60313,8049,1392,3471,7744,9746,681
StatMuse has team, game-level data for defensive rating going back to the 1984-85 season.