Ride report...
This past weekend, Pinkie and I rode to Beaufort to see AJ and Sassy. This was the first chance to ride 2-up with full luggage and the Bitubos. We rode a good bit on some back roads, and thought we were getting beat up by the shocks. I had adjusted the pre-load for the weight and had added what I thought was adaquate compression damping. The road we took, had these really nasty bumps running across the entire road, maybe 15 or twenty of them total. We were getting killed on them. We pulled over and I backed the compression damping back down to "Soft" trying to soften up the shock. Long story short, it wasn't too hard, but too soft. I should have put in more damping as we had to be bottoming out.
When we bottomed the Progressives, they hit, and hit hard. The Bitubos have a softer bumper, and it was soft enough that I didn't realize we were bottoming. I thought the shocks were WAY too stiff and hardly compressing at all. Not true.
I found this out tonight when I rode the bike to the dealer with my usual preload and damping set to soft. I slid the rubber bumpers down the shaft to rest on the body of the shock. Now, when the shock compresses, the bumper will get pushed up the rod, stopping to show the maximum compression. When I got to the dealer, it was almost to the very top, within 1/4". This tels me that I was almost bottoming out riding solo with damping set to SOFT. Now, I'll have to start experimenting with the damping adjustment to figure out the best setting, because SOFT isn't enough.