A question for you informed math/cycle junkies. On the charts they show percent gain in the mountains at about 6-9%. I KNOW it has to be steeper than that. Is there a diff when using metric. I tried to figure out one of the climbs today and think (if I did it correctly) that it came out to about 12 % but the chart said it was 8%. Can some knowledgeable person help me out....please