Welcome to a world of madness if you want to figure out the variables in adjustments to the suspension.
Without any adjustment to the shock top mount and just using rose joint adjustment, I tried to work out exactly what was going on when the hoop length changed.
I had found that I needed to dial in more rebound damping after one adjustment to the hoop as it was topping out when braking into a corner.
The adjustment also affects the sag and so I assumed that the preload was altered when the hoop was adjusted.
Drawing it out didn't really help me to understand any better. So I got a bit obsessed with it and made an accurate model of all the moving and fixed parts to full size, out of bits of mdf.
All the pivot points were accurately juxtaposed.
I provided adjustment to the hoop length and the ability to have the shock telescopic or fixed.
I played with it for hours and came to no proper understanding of all the variables in the geometry and dynamics, except for taking away that you can't change just one thing without altering other parameters. My model didn't even take into account spring rates or damper settings.
Adding an adjustable shock top position which alters shock length and lever moment from rocker pivot to shock top will just throw a massive spanner into the already mind numbing equation.
It did my head in so much that I gave the model to Utopia in the hope that I wouldn't find him one day, wide eyed, rocking in his chair, staring at it!
I'm sure he'd share it with you if you wanted?
My advice is to circumvent the madness and not try to understand it, just be guided by intuition and patience with setting it up.
Get your ride height, then set the sags and then the damping, be prepared to check all those again if you adjust anything.
Good luck. Sounds like fun..
