I built them in the past for a friend, he is still riding the same bike so they must work, not sure how they have never spun and shortened his eye to eye length.
The bushings shouldn't ever rotate relative to the frame. If things are working right the bushing should turn in the shock eye, not against the frame. That's the whole damn point of having a DU bushing in there.
I guess this is where I'm confused.......do these offset bushings replace the standard DU bushings? DU bushings aren't supposed to rotate with respect to neither the frame nor shock....they are pressed into the shock eyelets. Whatever is inside should be rotating (reducer hardware/pivot bolt, etc.) When you say "bushing", are you referring to the hardware that rests in the DU bushing and rotates?
Right, they're in the reducers that the DU bushings ride on. I'm too lazy to pull one of my bikes apart to take pics, but just picture the steel reducer that goes into the DU bushing with the hole drilled as close to the edge as possible, rather than centered. That's all it is.
I think I get it. I just don't see what's stopping that from rotating. The only thing holding it in any given orientation is the torque on the pivot bolt itself, no?
You've got the right picture. What's stopping it from rotating is that when you tighten the pivot bolt, the tabs on the frame will actually flex in a little and pinch the bushing there. If the bushing is made right, it'll be way easier for the DU bushing to rotate on it than it will be for it to rotate against the frame.
