The 19.5 lbs for my IP-057 was when I first built it, BTW, that also included the Eggbeater pedals. Since then, I added my Planet Bike computer, changed out the seat post to an Easton EC90, and changed the rear tire from a Racing Ralph to a Continental X-King. So the bike last weighed in at 20.5 lbs. Just those changes added nearly a pound to the build, half a pound from just changing the tires. The RR are stupid light but very thin and somewhat expensive, particularly since I didn't even get 500 miles out of the tire, for me that's not much tire life.