Its is a size 52, but has a 55 tope tube. The frame is claimed to be 840 grams. I did not get a chance to weigh it alone but it was damn light out of the box. The graphics and paint were a lot darker than I expected but I like it. I took for the local tue/thurs ride at the Rose Bowl tonight. Very smooth ride. If I had one word to describe it I would say "glides".