Serotta, really? I'm impressed. The new model weighs only a little less than the old one, but it is so much better in so many ways. It feels lighter and nimbler, the rider position is improved in a way I can't figure out, the gearing is appropriately higher, the bike seems to bounce over bumps much more comfortably. The easies telltale sign for me is that the new model has one tail light on the fender, whereas the old model has two tail lights very low, one on each chain stay. Whenever I pick up a bike, I look for a new model since I like it so much. Oh, it also has Sturmey Archer hubs rather than Shimano hubs, and the braking effort from the hand is much lower. The brakes inspire a lot more confidence.