BioMax
+1y
On a triangulated 4-link the simple way to find it is to extend your imaginary lines through the triangulated bars and where they meet is your rool center. On a parallel 4-link, you would look to your lateral limiting device (pannard bar, watts-link...). On a pannard bar, where the bar crosses the center of the rearend is the roll center height. On a watts-link, the center of the pivot is the roll center. It's not perfectly accurate, but knowing exaclty where your roll center is isn't all that helpful when tuning unless you can move it up and down.