Replacing rear cogs in order to go up steep hills

[GeorgeET]

Hi I looked up your bike, very nice with carbon frame road bike. So as a first time mechanical project on this expensive bike with a fragile frame I suggest you research well and maybe get your local bike shop to help.
Here are some links to great gearing info, and how to measure your crank to determine what drive chainset will fit.

The 46/36/24 sounds like a good combo, you may even be able to get the front deraileur to work with that.

http://sheldonbrown.com/gain.html

http://sheldonbrown.com/gearing/index.html

http://sheldonbrown.com/harris/chainrings.html

http://www.peterwhitecycles.com/chainrings.asp