A 5% grade is where things go from tolerable over long periods to hard over even moderate periods. Sustaining a 5% climb on a touring bike takes something out of you. 5% grade means 5ft of elevation increase over 100ft.
http://www.wolframalpha.com/input/?i=arctan%280.05%29
Or 2.9°, which seems like nothing.
It's a little humbling how hard some of the climbs felt when they translated to so few degrees.
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