The only positive thing you will gain with a shackle reversal is a much nicer, softer ride. Everything else is bad news, I destroyed my last sami because of running a shackle reversal. The big problem is your tires want to pull away from the hill you are climbing causing you to pull the front tires off the ground. This is what happened to me and I flipped over backwards then rolled several times. Would never ever run a shackle reversal again !