Quote Originally Posted by Triskeliongirl View Post
You will go faster *for the same effort* on a lighter bike, especially where climbing is concerned. That is because speed depends on your power to mass ratio.
And you have to decide how much are you willing to spend for the two or three minutes you may save by getting a lighter bike.

Here's a calculator that shows you how much faster you can be with a lighter bike.

http://www.kreuzotter.de/english/espeed.htm

Use a ride you have some data on and plug in the weight of your bike and then do the same thing with what you think a new road bike would weigh.

V.