The use of angioplasty in patients with previous coronary bypass grafts (CABG) has been described in several reports. CABG diameter often exceeds the size of the available coronary balloon dilatation catheters. Simultaneous inflation of two side-by-side balloons or a peripheral angioplasty catheter have been used to achieve optimal balloon-vessel ratio. We describe our experience with the two-balloon technique (case 1) and with a single peripheral angioplasty balloon (case 2) to dilate oversized CABG.