Originally Posted by
divtag
I spend most of my time in the 52-23 (for me ~15-17 mph).
This is the part I don't understand. If you want lower gears, why not use the 39T chainring more? A 52/23 combination is the same as a 39/17 combination and gives you several lower gears beyond that.
I understand the need for lower gears for climbing but you should make better use of what you already have.