I've read a bunch about changing out the rear cassette to get better hill climbing capability, but also understand that every choice has trade offs. I currently have a 12-25 (12, 13, 14, 15, 17, 19, 21, 23, 25), and am considering a 12-27 (12, 13, 14, 15, 17, 19, 21, 24, 27) for the race.
Any advice?
Any advice?