Ann Arbor Derby Dimes (A2D2) is a roller derby league based in Ann Arbor, Michigan. Founded in 2010, the league consists of two travel teams, The Brawlstars and the Arbor Bruising Co., which compete against teams from other leagues, as well as a home team, The Ypsilanti Vigilantes.
The league was started in May 2010, with an open meeting in Ann Arbor, and held other recruitments during the year. By 2011 the league was being led with the help of coach J.T. Slyde, who had helped train Ellen Page and Drew Barrymore for their roles in the roller derby film Whip It, when it filmed in Detroit and Ypsilanti. When formed, the league featured two home teams, the Tree Town Thrashers and the Huron River Rollers, and also their travel team, the A2D2 Brawlstars, before evolving to the present team structure. The A2D2 Brawlstars played their first bout ever on June 11, 2011, losing to the Floral City All-Stars of Monroe, and hosted their first public bout on September 17, 2011, at Buhr Park Arena, a 131-96 loss to Flint City Derby Girls from Flint.