The Sarthe was a 57 and the Trek 5200 was a 58 or 59, really not too much difference. I was suprized as well. I believe the difference was the Ultegra vs. 105/mix and lower end wheels. I looked at a Chambery today (59) and it was a tad over 20lbs with full Ultegra which was a suprize as well. The bottom line is, there seems for me to be no real reason not to get steel over the other Alum/Carbon bikes at there. I am not trying to compete at the 10/10 level with a $5K all carbon bike and the ride of that Sarthe has yet to be beaten. I think it would be fun though to outfit the Sarthe with some carbon parts like handlebars, stem, Toupe seat and pedals just to see if you could drop below 18lbs.