I'm considering making the above change in crank sets primarily because 53/39 is really hard on the hills here. I have 11-28 at the back.
I don't see a downside to this since it seems like I will always be in the middle of the cassette while climbing. Of course my speed on the flats will take a hit but I don't spend too much time on 53/11. Also if it seems like too much, I can always go for 11-25 in the back.
I'd appreciate any comments on your experience with a 46/30.
Combinations with a chain angle greater than 1.5° are grayed out. I think this analysis confirms that my ability on flats and descents will be different (different gear ratios).
However, the effect on climbs (within the chain angle constraint) is equivalent to swapping the 2.43 ratio (on the 34) for the 1.25 (on the 30) which is fine by me.
First ride update: As expected, I can't mash and accelerate anymore, but it doesn't matter. I really enjoy the high cadence and the fact that I can still hit the same speeds as before (albeit slower). I'm looking forward to my first big climb on Wednesday!