How do you know the grade you're climbing? I notice people mention it, but am not sure if you know because you're in an area where it's marked, or...?
I'm fooling around with routeslip and see that one of my "tough" little climbs in the neighborhood is only a 40 foot climb on .46 mile, which doesn't look like that much in black and white. (Of course, I'm riding a 40 pound bike and carrying that much extra weight, which may be why it FEELS like so much, gack.)
Anyway, is there an instrument you use on your bike to tell you the grade?