This bike is one of my road bikes set up for one thing, climbing. It is equipped with a 12-34 cassette and a 48/36/26 triple. If I turn east on the main street of town, I start climbing toward a 4500 foot mountain pass. There is one 7 mile section that averages 6%.
The real hill climber. My touring bike with an 11-34 cassette and 44/32/22 crank. This one saw action in the Swiss Alps last summer. I just put the same setup on my cyclocross bike.
On my "fast" road bike I run an 11-27 cassette, but don't ride it as much as I do that Trek.