Originally Posted by Camilo

"Small parts": Pedals, seat post, stem, handlebars, saddle, tires, tubes, even bar tape. A lot of these things you can find second hand on EBay and/or don't cost any more than their heavier counterparts. Pay attention to that stuff. They all add up an ounce or two at a time. If you have to replace parts for fit, get lighter ones. You can get ~1500 gram alloy wheels for not too much $, so consider that before you spend $1000+ for CF wheels, maybe spend that money on upgrading all the little parts. Sram groups are generally a bit lighter than comparable priced Shimano, be sure to check that out. Contrary to some experience, I haven't seen any meaningful difference between Shimano and Sram rim brakes, and since I prefer Sram ergonomics, it's good for me in the weight department.