I'm thinking about changing my double crank (39/53 right now) because I need lower gears for some pretty big hills I'm working on. I have a 12/27 cassette.
One is to go all the way down to a 34/50. If I did the calculations right, this would make my lowest gear almost excactly the same as if I had a 31 on the rear. But a mechanic told me some people are not happy about the shifting with a 34/50 and maybe I should just do a 36/50 which he said no one seemed to complain about.
A 36 would be just a bit better than having a 29 cog in the rear.
Later I started wondering if a another possibility was a 35/50 (like having a 30 cog in back).
So, I need feedback on people's experience with the 34/50 mainly, plus any comments you may have about the other two possibilities.