Skip a meal or two before biking, THAT will lighten the frame...but you will run out of gas at the first hill! I'm glad I'm in flatland Florida, hills are kind on my 79 LeTour (6lb 4oz naked frame). According to Weight Weenies, a 57cm runs 1770 grams. They have a LOT of numbers over there.
http://weightweenies.starbike.com/li...ype=roadframes