I am one of the weight weeny types that has a sub 15lb bike. It helps climbing, that's it. If you have a 18lb bike and you lose three pounds, we're even. It actually helps descending having more weight, the heavier guys can fly down a freaking hill.

Ever notice TT bikes are always heavier than their road cousins. They bank on being more aero and making their riders more areo too. They are not concerned with weight, a disc rear wheel weighs almost as much as both of my wheels.

Find a bike you like, that's comfortable, that you will ride ..... don't get obsessed with the weight unless you have lost as much weight as you want and climb a LOT of hills and the extra weight will make such a difference that you're willing to pay a ton more for your bike.

The best thing about a sub 15lb bike.....bragging rights. Beyond that, it's fairly limited.