Right now, I've got a SRAM 11/26 cassette. I just moved to San Francisco, and some of the climbs out here (e.g., Mt. Tamalpais) are pretty brutal with over an hour of climbing. My cadence over some of the steeper sections towards the top tends to hover around 70, when I'd much rather be up at 80 or 90. I've been considering switching to an 11/28.
The thing stopping me from doing so is wondering if it would be better, training-wise, to grind it out for now until my power and endurance improve, bringing my ability up into the range where a 26t climbing gear is appropriate. I'm afraid if I switch to a 28t, I'll use it as a crutch. Should I stick it out with the 26t until I get stronger?