In the morning, the store gives away 19 bikes * 2 bike clamps = <<19*2=38>>38 bike clamps.
In the afternoon, they give away 27 bikes * 2 bike clamps = <<27*2=54>>54 bike clamps.
So in total, the store has given away 38 + 54 = <<38+54=92>>92 bike clamps.
#### 92