Originally Posted by
Banzai
That is the other reason 50/36 is my favorite. Rare, but I have done the 12-30 big cassette for some mountain climbing. That cassette normally lives on my 'cross bike, but has twice migrated to my roadie with the 50/36 for climbing duty.
I'm a wimp. I put the Ultegra 12-30 on all my bikes with the 50/34 on front. At times, since I'm a masher, I've wished for a little bit more than a 50/12, but I often put that 30 to use on the slopes.