A bearing retaining assembly for a supercharger includes a first sleeve, a second sleeve and a biasing member. The bearing retaining assembly rotatably supports an input shaft that rotates about an input shaft axis. The first sleeve can have a counterbore that receives a bearing. The second sleeve can be fixed to a cover of the supercharger. The biasing member can be disposed between the first and second sleeves. The first sleeve can selectively translate along the input shaft axis relative to the second sleeve against the bias of the biasing member.