I have been riding a bike with a triple 52-30 chainring and 9 sp. 12-26 cassette. I just purchased a new bike with a Dura-Ace double 53-39 chainring and 10sp. 12-23 cassette.
I love the new bike but, my problem is that the new bike does not have a low enough ratio for some of my climbs (for me).
Changing to DA triple would be pretty expensive (considering a new crankset, BB and shifter) so I am considering changing the 12-23 cassette to a 12-27.
If I make this change, will I have to add links to the stock chain and/or change out the rear der to a longer reach?