I put a pair of 11.5"Progressive 412's on my 2004 Speedy about 6 months ago.
Jo & I weight about 90 Kgs. (200 lbs.) each and when we ride 2 up we never have any problems bottoming out.
I have the shocks set on the next to hardest setting. The only time we do have a small problem is on one of our local roundabouts where there is quite a lot of camber. I tend to grind away the allen bolts on my Staintune mufflers.
