My wife and I rode two up yesterday, and bottomed out the frame around a corner (not a twisty). Now to explain: we are each 250 lbs+. The spring was turned all the way to high, and I was 36 in the front and 44 in the rear. We were not carrying anything else and the speed was under 20mph. What can we do to prevent the bike from bottoming out again, other than the obvious (lose weight, Ohlins shock) ? We like riding together, but not if it destroys the bike! And we can't get her a bike yet.