I live in a pretty hilly area, so if I take out the fixie (which I do just about every day) I'm going to be going uphill. Not mountains, not huge hills, but hilly nonetheless. So of course when I'm going uphill i'm just mashing away. But now i've noticed that my comfortable spin on my roadie has gone from 95-100 to probably 87-92. When I say comfortable spin, I mean cadence/speed vs. effort. Is there something else going on or are my legs just adjusting to the mashing?