Josh, re: percent grade, Notch tops out at 24%. I've been flagging lot of trail this year and am taking great interest in grades, so just as an example, the climb up the double track in Strawberry Hill Farm has pitches of 30%. I'll bet that the descent on Sphincter hits 30 (though I haven't measured). The new trail above Kimmer's hits 18-20% a few times. 47% - that's crazy, but I'd bet you've ridden cool down or two that approaches that. Not saying Cop Killer is easy or that I could do it. Just saying the grades aren't what you think.